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Physics 101 Mechanics
May 2023
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Physics 101 Mechanics
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May 4, 2023
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May 4 of 2023
A proposed space station includes living quarters in a circular ring 61.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth? It takes 2.20 s for a small ball with a mass of 0.130 kg released from rest from a tall…
A child on a sled (m = 47.0 kg) slides down a long hill starting from a rest position at a point 10.0 m higher in elevation than his finishing point. a) What is the total mechanical energy present? b) Assuming that there's no friction and no external pushes, determine the child's speed at the…
As the velocity of an inertial frame of reference increases with respect to a stationary observer, Einstein's theory of special relativity predicts that the length of an object, measured in the dimension parallel to the motion of the reference frame, will A. decrease B. remain unchanged C.…
A 30-caliber rifle with a mass of 2.94 kg fires a 7.33- g bullet with a speed of 656 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet? (Note there is a tolerance 0.1 percent for the answer) ____A 8.65- g bullet from a 9-mm…
A 68-kg ice hockey player standing on a frictionless sheet of ice throws a 5.0-kg bowling ball horizontally with a speed of 3.4 m/s. With what speed does the hockey player recoil? An MSU linebacker of mass 112.0 kg sacks a UM quarterback of mass 86.0 kg. Just after they collide, they are…
If you have an object hitting a stationary object of equal mass in an inelastic collision, what will happen?
A 0.145- kg baseball traveling 38.30 m/s is stopped in 0.193 s by a catcher's mitt. What is the average acceleration of the ball? ____What is the average force on the catcher's mitt? ___A 0.145- kg baseball with an initial speed of 24 m/s rebounds with a speed of 35 m/s after being struck with…
State the orbital angular momentum of an electron in the following orbitals: a. 4d b. 3p
What is the momentum (in kg m/s) of a 99- kg football player running at a top speed of 9.9 m/s? What is the momentum of a 8.92- g rifle bullet traveling at 738 m/s? ______A croquet mallet delivers an impulse of 8.37 N s to a 0.39- kg croquet ball initially at rest. What is the speed of the ball…
Answer the following questions. a.) If a tuning fork with a frequency of 440 Hz is tapped together with the guitar strings strung, how many frequencies are there from the guitar strings? b.) If the same tuning fork from a.) is tapped and playing the trumpet at 446 Hz, find the frequency heard…
The car approaches Mr. Ronaldo in a straight line with a speed of 50 m/s, emitting sound waves with a frequency of 1,000 hertz. (Set the speed of sound to be 350 meters per second.) a.) If Mr. Ronaldo stands still, what frequency will Mr. A hear from the car? b.) As the car passes by, what…
A solid sphere is rotating about an axis that passes through its center, and so is a thin-walled spherical shell. They have identical masses, radii, and kinetic energies. The angular speed of the shell is 6.54 rad/s. What is the angular speed of the solid sphere?
An arrow is shot from a bow vertically upwards. Neglecting air drag, after leaving the bowstring, what is the arrow's acceleration?
Why is Compton scattering normally performed with X-rays and not visible light?
A simple pendulum of mass 0.275 kg is tied to a light rope 1.10 m long and pulled so that the rope is at an angle of 5 degrees to the vertical. Let it start swinging from a standstill so that the pendulum oscillates at an angular frequency of 2.97 radians/second. a.) Find the magnitude of the…
A jogger runs at 4.0 m/s for 1000 m, stops at lights for 50.0 s as they change, then runs at 3.0 m/s for a further 1500 m home. What was her average speed?
The density of the thin rod of length l increases uniformly from λ at one end to 2λ at the other end. Determine the moment of inertia about an axis perpendicular to the rod through its geometrical center.
What are the biological, microscopic, and macroscopic effects of acute, high-dosage, ionizing radiation exposure on the human body? Describe what occurs within the cells. Which cell types are most affected by acute radiation exposure? What are the macroscopic effects of damage to these cells?…
In an alloy consisting of 12.8% metal A and 87.2% metal B by weight, the weights of metals A and B are 61.4 g/mol and 125.7 g/mol, respectively, and densities of 4.27 g/cm^3 and 6.35 g/cm^3, respectively. If the edge length of the unit cell of this alloy is 0.395 nm, determine whether the…
Consider two circuits with resistors in series and in parallel. In each case the applied voltage is 12 V and the current is 12 mA. a. What is the value of each resistor when they are in series assuming R1 = R2 = R3? b. What is the value of each resistor when they are parallel assuming R1 = R2 =…
A child is riding a merry-go-round that is turning at 10 rpm. If the child is standing 4 m from the center of the merry-go-round, how fast is the child moving? 4.19 m/s 1.80 m/s 0.556 m/s 5.64 m/s 3.50 m/s
An object is placed at the origin. A lens of focal length, f, is placed at X=30 cm. A lens with a focal length of -20 cm is placed at x=35 cm, and a lens with a focal length of 10 cm is placed at x=43 cm. An image of the object is projected onto a screen located at X=57.7 cm. Determine the…
A fireman slides down a fire pole in his station at a constant speed. We know: a. the net force acting on him is zero. b. there are no forces acting on him. c. he is accelerating. d. he is decelerating.
weight of 800 N is hung from a spring with a spring constant of 2000 N/m and lowered slowly. How much will the spring stretch? 4.00 cm 40 cm 6.00 cm 20.0 cm 12.0 cm
Calculate the sedimentation velocity of a lead sphere with a diameter of 20 micrometers in still air. The density of lead is 11,300 kg/m^3, and the viscosity of air is 1.81 x 10^-5 kg/m.s.
4.0 J of work are performed in stretching a spring with a spring constant of 2500 N/m. How much is the spring stretched? 3.2 cm 5.7 cm 5.0 cm 0.3 cm 3.2 cm
Shown are 2 positive 30C charges on opposite corners of a 10cm x 10cm square. What charge needs to be placed at the top right empty corner so that the net electric field is zero at the bottom left corner, point P? Be sure to both state the size of Q's charge and whether it is positive or…
The speed of the Airbus A340 plane is 190 km/h. The coefficient of friction between its wheels and the tarmac is 0.08. The braking system of the plane and the air drag combined are able to decrease the speed at a rate of 0.6 m/s². What is the safe length of the runway?
There is a steady water flow in a pipe. Pressure at point (1) is 300 kPa and at point (2) 100 kPa. Calculate pipe diameter at (2), when velocity at (1) is 19.7 m/s and the flow can be assumed frictionless. Round off the answer to three decimal digits in m, but enter your answer without the…
Two particles with angular momentums L1 = 1 and L2 = 2 . A) Find the expected total angular momentum . B) How many independent state exist in the coupled representation . C) Write the coupled state | 3 2 > as linear combination of the uncoupled states and find the Clebsch-Gordan coefficients .
What is the difference in electric potential, between points A and B? (b) What is the difference in electric potential, , between points B and C? (c) What is the difference in electric potential, , between points C and A? (d) From the information given in this problem, is it possible to…
Calculate the angle of refraction when a light ray strikes a water/glass interface at an angle of incidence of 32.5°.
What steps and information are needed for an organization to incorporate grant seeking and proposal writing into its fundraising operations? What are the necessary elements to build a long-term partnership with a foundation?
Question 1A: A 2-kg object moving at 1.5 m/s collides with and sticks to a 1-kg object initially at rest. Determine the speed (in m/s) of the system as a result of this collision. 2.0 3.0 2.3 1.0 Question 2A: A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling…
A 0.2 kg hockey puck, sliding on an outdoor rink, has a velocity of 10 m/s [forward] when it suddenly hits a rough patch of ice that is 3 m long. Assume that the coefficient of kinetic friction between the puck and the rough ice is 0.47. Calculate the magnitude of the force of kinetic friction…
A binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. Assume the orbital speed of each star is 220 km/s and the orbital period of each star is 14.4 days. Find the distance between the two stars. Find the mass M of each star.
Determine the velocity potential of the (2-D) flow due to a moving circular cylinder with velocity U in the positive x-direction by means of the method of separation of variables. Take the radius of the cylinder as “a” and compare your analytical result with the result obtained by using…
Does the "s" orbit split due to spin-orbit interaction just like the " p" orbit and how ?Does the "d" orbit split due to spin-orbit interaction just like the " p" orbit and how ?
22. An exploration vehicle is located in the floor of a sea at a depth of about 2, 200 m below the surface of the water. The density of seawater is (a) What is the pressure at this depth? (b) What force would the water exert on the vehicle's observation window ?
What is the force (in N) acting on an electron at a point 1.6 nm from a nucleus with atomic number Z = 80?
A proton accelerates along the line joining the two charges of a dipole, away from the dipole. The dipole is made up of two charges, both 60 nC in magnitude, separated by 0.5mm. What is the proton’s speed when it is 1cm away?
Show that forward difference is a first order accurate scheme. Using forward and backward difference, show that central differencing is a second order accurate scheme.
Sarah and her friends went to enchanted kingdom to try a newly opened roller coaster with an empty cart of mass 120 kg. A part of the ride is a vertical loop with radius 12 meters. At the bottom of the loop, the cart has a velocity of 25 m/s, while 8 m/s at the top. As the cart rolls from…
Mrs. Santos weighing 61 kg steps on a bathroom scale that contains a stiff spring. In equilibrium, the spring is compressed 1 cm under her weight. What is the force constant of the spring and the total work done during compression?
A 3.15 kg weight was hanged on the tip of an ideal spring with negligible mass which is measured to be 13.40 cm long. What would be the total length of the spring if we wanted a 10 J potential energy in the spring considering that it's initial length is 12 cm when nothing is attached to it.…
Two coaxial metal cylindrical tubes, of radius a and b > a, represent a cylindrical cable. The inner conductor at a carries a linear charge λ and the outer conductor at b is grounded. Assume an arbitrary length L. a) Determine the electric field in the region between the two conductors. b)…
A pilot was assigned to MH730, which is an Airbus with four engines. Each of the jet engines develops a thrust (forward force on the airliner) of 72,000 lb when the airplane is flying at 250 m/s. What horsepower does the engine develop?
There is a 20kg block that lies on a triangular block that is inclined at an angle of 30 degrees. a) What force parallel to the ramp would prevent the block from moving (assuming that 1kg exerts a force of 9.8N)? b.) What is the force of gravity (Fg) acting on the block?
An electron beam is emitted from a cathode (z=0) to an anode (Z=L) at distance L, with a radius d such that d << L. N is the number of electrons per second in the beam. dV is the potential between the anode and cathode. Treat the anode and cathode as a point/sink connected in a circuit with a…
The laws of physics are the same in all inertial frames of reference, but the "twin paradox" states that the traveling twin will experience time dilation and be younger than the other twin upon returning to Earth. How are both of these statements correct?
An electron is moving to the left in a magnetic field pointing towards the top of this page. What direction is the resulting force on the electron? Answer options: into page, toward the top of the page, out of the page, toward the bottom of the page, none of these are correct.
A perimeter fence around a dangerous device has a height of 1325 mm. The dangerous device has a height of 2150 mm, and the horizontal distance from the device to the fence is 550 mm. The company policy specifies that all perimeter fences can be designed using the standard specifications.
Outline an important factor to determine the notch toughness of a metal in impact test.
Define reverse engineering. What is the function of the (a) hardware and (b) software systems in reverse engineering? Are there any ethical or legal issues that may arise when using reverse engineering? Describe three ways in which a company can apply reverse engineering to its own…
hello I'm having difficulty in thermodynamic mainly due to finding these formulas Ur using . for Q the heat u r using various different formula's some have voltage current and other have work and whatever . is there any place I can find the list of all these formulas used in thermodynamics it…
An elevator is designed to travel a height of 4.5 meters when loaded and will have a maximum gross weight of 250 kg. A coil spring is provided below to absorb shock in the event that the elevator should fall freely because of sudden breakage of the wire rope carrying it. If the coil spring is…
the rotor of an electric motor has a mass, m, 180 kg and a radius of gyration, k, 150 mm. Calculate the torque required to accelerate it from rest to 1,500 revs/min in 8 s. Neglect friction.
Consider the purely subsonic flow in a convergent-divergent duct. The inlet, throat, and exit area are 0.90 m^2, 0.60 m^2, and 0.75 m^2, respectively. If the inlet Mach number and pressure are 0.4 and 7000 N/m^2, respectively, calculate M and p at the exit.
The drawing shown below is a representation of a redesigned stepped bar component utilized in a field cultivator employed in the farming industry to prepare soil for planting. The stepped bar consists of a 21 mm square section bar (AB) of length 45 mm; a 15 mm diameter bar (BC), length 60 mm;…
Consider a gas with a specific heat ratio of 1.48 at the Mach number of 6.5. Determine the strength (the pressure ratio across the shock, p2/p1) of the normal shock.
For a given Prandtl-Meyer expansion, the upstream Mach number is 3.8 and the pressure ratio across the wave is p2/p1 = 0.5. Calculate the turning angle, θ, in degrees (°) relative to the free-stream direction.
At a point in the flow over a high-speed missile, the local velocity and temperature are 1000 m/s and 300 K, respectively. Calculate the Mach number M and the characteristic Mach number M* at this point.
An engine valve spring having 12 coils has the ends squared and ground. The outside diameter of the coil is 110 mm and the wire diameter is 11 mm. It has a free length of 180 mm. A. Determine the length of the wire to which this spring must be initially compressed to hold a bolt pressure of…
10.14 A pair of gears for a hoist have the following specifications: 20° full-depth involute teeth; o. pinion = 80 MPa; o. gear = 55 MPa; pinion has 20 teeth; gear has 80 teeth; and pinion transmits 5 kW at 200 r/min. Determine (a) the standard module and face width which will satisfy these…
10.11 The following data relate to a spur gear drive: Power transmitted by the motor pinion = kW at 750 r/min; gear ratio = 3,5; teeth 20° stub involute; starting torque = 130% of torque rating; 18 teeth on pinion; pinion and pear made of 1 he same material (0. = 250 MPa); motor shaft = 45 mm…
The Incoming wind at 1 bar, 20°C and 12 m/s is swept along a wind turbine of 2 blades of 50 m diameter. If the air velocity at the turbine downstream is 8 m/s, calculate the axial thrust on the wind turbine axis.
Need help, please! How to Optimize Mechanical Properties of Materials Composites through their Microstructure with Articles as References.
4) 2 kg of Refrigerant 134-a is contained in a constant volume tank as a saturated vapor. When it is heated, the refrigerant pressure and temperature become 400 kPa and 50°C, respectively. Determine the change of entropy of the refrigerant during this process. If the heat transfer is coming…
I am looking to design a gear system in order to move a door upwards 2.25 inches. To do so I am using a rack and pinion system, where the rack is connected to the door and half of the rotation of the gear should cause the rack to more the 2.25 inches in one direction. What dimensions of the…
Determine the overall yield of a production line of 100 stations, each with a 99% yield? explain with formula Give two top differences between Lean Six Sigma, and defect based Six Sigma (one sentence each).
A closed, rigid tank is filled with water, initially at saturated liquid at 140°C. Water is then heated until the temperature reaches 200°C. Determine the heat transfer in kJ/kg.
A compact car with a mass of 1,200 kg and a drag coefficient of 0.4 uses 30-cm-radius radial tires and has a 3.2-reduction differential. The engine of this car develops a torque of 235 N-m at 3,500 rpm, and a power of 110 kW at 5,500 rpm, with a transmission efficiency of 0.9. If this car can…
A 2m x 2m x 2m furnace is made out of 10mm mild steel. It is aligned with 100mm fire brick clay. What is the heat storage of the complete furnace if the inside of the furnace is 1650°C? Make assumptions on required information.
Is the accuracy of a CMM equipped with a touch probe going to be affected by the diameter of the probe tip?
I have a question about retaining the structure of a material. I'm working on a project at the moment and I was wondering if there are ways to laminate cylindrical objects through a desktop laminator. The key idea is for it to remain cylindrical after lamination. I've tried inserting some…
The task of estimating water needs is complicated by conflict between current practice and conservation. Simple conservation methods such as flow control and partial recycling of water can reduce daily usage by a 5% and 10%, b 10% and 20%, c 20% and 40%, d 25% and 50%.
What is most nearly the moment of inertia of a rectangular 46 cm x 61 cm beam installed in its strongest vertical orientation?
What rod end pressure (in psi) is required to decelerate the 3 cylinder to 60 ft/min to zero velocity in 1/4 in. at the end of the extension stroke? Assume that the rod diameter is 1 in.
Which of the following would permit you to find the portion of vector A which is parallel to vector B? Group of answer choices: a unit vector in the direction of A, the magnitudes of vectors A and B, a unit vector in the direction of B, the magnitudes of both A and B, and the product A dot B.
An experiment is to be conducted to determine heat transfer coefficient on the surfaces of tomatoes that are placed in cold water at 7 [Degree Celsius]. The tomatoes (k=0.59 W/(m*K), alpha=(0.141*10^-6) m^2/s, p=999kg/m^3, Cp=3.99KJ/(kg*K)) with an initial uniform temperature of 30 [Degree…
The coefficients of static friction at the contacting surfaces are µA = 0.25, µB = 0.34, and µC = 0.39. The 100 kg roller (solid) and 40 kg tube (hallow) both have a radius of 150 mm. Determine the maximum amount of friction force that can act at point C before slippage occur. Answers are: 455…
If the coefficient of performance for a refrigerator is QL/W and the COP is QH/W for a heat pump, how do these measures of efficiency differ? (a) only in the heat goal (b) L and H don't matter (c) they are always less than a heat engine (d) they are the same.
Generally, _____________ is taken off by the square foot for surface area, linear foot for pipe insulation, and by the individual piece for fittings or doors.
The coefficients of static friction at the contacting surfaces are μA = 0.25, μB = 0.34, and μC = 0.39. The 100 kg roller (solid) and 40 kg tube (hollow) both have a radius of 150 mm. Determine the maximum amount of friction force that can act at point C before slippage occurs.
Which of the following is (are) NOT considered as an inspection? Explain. [5] a. Checking the gas consumption of a vehicle before it is shipped to a customer b. Checking the accuracy of a sensor before it is shipped to a customer c. Checking the paint color and smoothness of a car body d.…
Solve both A) An inventor claims that a new heat cycle will develop 0.4 kW for a heat addition of 32.5 kJ/min. The temperature of heat source is 1990 K and that of sink is 850 K. Is his claim possible ? B) Steam at a pressure of 5 bar passes into a tank containing water where it gets…
Reanalyze the bone in Exercise 6.2 assuming that Mp/R is proportional to the radial gradient of stress. Assume that a positive stress gradient produces resorption (Mp/R < 0) and a negative stress gradient produces formation (Mp/R > 0). (A positive stress gradient is defined as one in which the…
An external spur gear with a pitch angle of 20° has a diametral pitch of 3. The spur gear drives an internal gear with 75 teeth to produce a velocity ratio of 1/3. Determine the center distance.
Reanalyze the bone in Exercise 6.2 assuming that Mp/R is always formative and proportional to the magnitude of the longitudinal surface stress. How does the shape of this new bone distribution compare with that seen in Goodship's pig osteotomy experiment (Fig. 6.8B)? Discuss how the shape of…
You are at the top of the Mount Everest whose height is 12,000 ft. Find the gravity force generated by you (80kg) using the provided equation of the attraction force in N?
The power generation company "Luz del Norte" has a Francis turbine operating with a net head Hn of 54 m and a flow rate Q of 9 m^3/s, rotating at a speed N of 300 RPM. The diameters corresponding to the inlet and outlet sections of the runner are, respectively, D1 = 1.5 m and D2 = 0.8 m. The…
11-33 A plant manager has to choose between replacing five 4-hp standard motors and replacing one 20-hp standard motor with high-efficiency counterparts. The existing efficiency of the small motor is 0.83, and its replacement has an efficiency of 0.89. The efficiencies of the existing large…
The Reynolds number, Re, is a very important parameter in fluid mechanics. Determine its value for water flowing at a velocity of 2m/s through a 20cm diameter pipe
Nitrogen flows at a velocity of 54 m/s into the inlet of a 10.2 cm pipe. The pressure and temperature at the inlet are 301.5 kPa and 24 °C, and at the outlet, they are 183 kPa and 18 °C. The gas constant for Nitrogen is 0.2968 kJ/kg/K, the specific heat is 1.039 kJ/kg/K, and the density is…
0.6 m3 Argon is contained in a piston-cylinder device at 1.2 MPa. Argon now expands until the volume triples and pressure halves. The gas constant for Argon is 0.208 kJ/kgK. Find the work from/to the spring within 4 sf and appropriate units.
18.7 If the air from the end of the pipeline of Problem 18.6 is delivered through 60 ft of 1 1 2 -in. hose to a rock drill that requires 120 cfm of air, determine the pressure at the drill. Change the size of the pipe, fittings, and valves to 5 inch
k = 1.4, R = 287 J/kgK and Cp = 1004 J/kgK. Air at a stagnation pressure of 1000 kPa and stagnation temperature of 700 K enters (via a Laval nozzle with an exit to throat area ratio of 1.38 preceding the duct) a constant area duct with heat addition of 800 kJ/kg. (a) Show that if the flow…
3 ft^3/sec of moist air at 90°F, 14.7 psia, and 100% relative humidity enter an air conditioning unit and is to leave at 14.7 psia and 60°F with a relative humidity of 40%. Any liquid water that must be extracted or supplied will be at 40°F. Steady-state conditions exist.
Solve the eigenvalue problem for the fixed-pinned beam. Then, numerically determine the first four modes and sketch the mode shapes
The pipe coming out of the pump is experiencing excessive vibrations. The pipe can be modeled as an SDOF system. The stiffness can be calculated by measuring the deflection (1 cm) when a force of 200 N is placed on the pipe. Additionally, a push test (pushing the pipe and letting it vibrate)…
In order to augment the rate of cooling of a device, a pin fin of 2.5mm diameter is attached to its casting. The wall of the casting has a temperature of 95°C, whereas it has a temperature difference of 70°C with the surrounding air. Primarily, the heat transfer occurs through natural…
Assume that a system must operate 40 hours per week, 50 weeks per year, for 15 years, in response to a designated customer need. The system MTBF is 400 hours, the average MCT is 2 hours, and 2 maintenance technicians are assigned for the duration of each maintenance action. Determine the MLH/OH…
Ferrite steel is often used as the material for a reactor pressure vessel. After 40 years of service, it was found that Cu-rich clusters or precipitates are generated in the alloy. These precipitates can act as pinning points for mobile dislocations. The density of the precipitates is 1×10^15…
Consider an uninsulated wire with a diameter of 1 mm generates electrical heating at the rate of 2 W/m^2 when it hangs in air. The temperature difference between the wire and the ambient air is 25°C. To cover the wire with an electrical insulation, the thermal engineers consider using a…
Suppose a force is described as {30i - 40j + 20k} N using the Cartesian vector representation. What is the magnitude of the force and the direction angle β (formed by the force and positive y-axis) respectively?
Solve the eigenvalue problem for the "fixed-free" uniform elastic rod in extension. The rod has density Ï, cross-sectional area A, elastic modulus E, and length L. Then, determine the first four modes and sketch the corresponding mode shapes.
The following expression represents the heat generation rate within a cylindrical fuel element for a gas-cooled nuclear reactor: q(r) = qo[1 - (r/R)^2](w/m^3). Where qo denotes a constant term and R shows the radius of the fuel element. Considering the outer surface of the cylindrical element…
We can model the crankcase of an automobile as a flat plate of 10 cm thickness, 60 cm length, and a 20 cm width. Consider the surface temperature of the crankcase is 77°C when the vehicle moves with a speed of 108 km/hr. Moreover, the vibrations of the engine and chassis cause the boundary…
During a quenching process, a 0.01 diameter and 0.2m long cylindrical rod made of 1080 Steel is heated to 750°C and then placed in water at 80°C. Considering a convection heat transfer of 250 W/m^2·K, how much time will the rod be at 300°C?
Design an extension coil spring to handle a dynamic load ranging from 275 at 325 N, during a working deflection of 10 mm. Use silicon chrome wire and standard hooks. The forced frequency is 800 cycles per minute. if you want life infinite. Determine the appropriate factors of safety against…
A compression coil spring is required to provide a variable force on the time to go from a minimum of 100 to a maximum of 300 lbs. in one working deflection of 1 in. It needs to work freely on a 1.25-in-diameter shaft. Use a cold-drawn carbon steel wire with a Sut = 250 ksi. You want an index…
A block of mass m = 8 is attached to a rigid pole of length L = 2 m. if the block has a velocity of 4 m/s as it travels through the horizontal, what is the distance between the blocks lowest and highest points? Neglect the mass of the pole. neglect air resistance and any frictional forces
Molecular weight refers to the length of a polymer molecule. t/f?
Using the equation WL^3/3EI for a simply supported aluminum beam, find the deflection. We know the beam is aluminum, it's 18.39 mm wide, 2.55 mm deep, 400 mm in total length, and a weight weighing 300 grams hangs directly in the middle of the beam. Find the aluminum beam's deflection in mm.
Consider the ODE given by: x''(t) + c x'(t) + k x(t) = r(t). For c = 1 and k = 4, plot the position and velocity over the time interval [0, 20] seconds for the following cases. Analyze and discuss each result. Compare the two results. 1) r(t) is zero, x(0) = 1, x'(0) = 0. 2) r(t) is zero, x(0)…
Calculate the horsepower (HP) required to increase the pressure of water at 45°C by 220 psi, while delivering 67 imperial gallons per minute. Answer to one decimal place. Water at 45°C = 990.244.
Given a shell and tube heat exchanger with a heat transfer fluid on the inner tube with a heat transfer coefficient h1 = 30 W/(m2 K) and a fluid on the outer side of the tube with heat transfer coefficient of h2 = 55 W/(m2 K ). The tube is made of stainless steel with a thermal conductivity of…
In the Gas Permeability test performed with a standard cylindrical sample, the time was measured as 58 seconds. Calculate the permeability value of the molding sand using the Gas Permeability formula.
In the Standard Cylindrical sample preparation step, you started with 158 g of sand. However, you did not achieve the desired height of 2 inches after 3 compression strokes. The sample ended up being shorter than expected. What should you do in this situation? Please provide detailed…
Why is flux (slag cleaner) added to liquid metal? Why does slag separate from metal? Is it possible to cast without removing the model from the mold? In what situations does this event give us an advantage? Please give detailed information. Thank you!!
calculate the test section Mach number from the measured oblique shock wave angle (wedge section aerofoil) the evolution of the flow over the wedge shall also be calculated.
What is a degree? Is it possible to mold without a degree? Indicate the importance of compression in the molding process. What casting elements should be placed outside the model of the part, including the degree, when molding the upper half of the model? Please give detailed information. Thank…
What are the main types of nuclear fuel geometry shapes? solution :Nuclear energy
A 5,100 ft3 air stream exits a heating unit at 80°F and 60% RH and then mixes with 28,000 ft3 of air at 70°F and 40% RH provided to the building from another source. What is the combined dry-bulb temperature of the air in the building? Note: there is no exhaust in this problem. The total air…
Q1) Transition from laminar flow to turbulent flow occurs when a) Reynolds number decreases b) Reynolds number is constant. c) Froude's number increases. d) Reynolds number increases. Q2) Cavitation is aggravated by utilizing liquids at high temperatures where their vapor pressure is high or…
A stepper motor is to be designed to meet the following requirements: → The stator must have 3 phases → The required full step size is 5° Determine the number of rotor poles.
The gas generator of a two-shaft gas turbine has a compressor pressure ratio of 5 and compressor and turbine inlet temperatures of 80°F and 2000°F, respectively, at sea level. All turbomachines have efficiencies of 90%, and the inlet air flow is 50 lbm/s. (a) What are the net work, pressure…
Water enters a 0.004 m diameter and 21 m long tube at 45ºC with a velocity of 0.5 m/s. What is the required length of the tube, in m, in order for the water to exit the tube at 25ºC if the tube is maintained at a constant temperature of 5ºC?
The feeder-selector system for Station #3 in your synchronous 6-station assembly machine has just suffered catastrophic failure and is not repairable. Luckily, your company has another similar feeder-selector system in storage, but the control parameters need to be recalculated to properly set…
10: The shaft is fixed to the wall at A and is subjected to the torques shown. Determine the maximum shear stress in the shaft (ignore stress concentration effect).
Explain why we can decouple (separate) the six equations of motion of an aircraft into three longitudinal equations and three lateral-directional equations. Which forces and moments contribute to each set of equations?
How much energy (units of BTU) does an HVAC heating unit need to add to 5,000 ft³ of air at 55°F and 70% RH in order to condition it to 80°F and 60% RH?
A simple turbojet is operating with a compressor pressure ratio of 8.0, a turbine inlet temperature of 1200 K and a mass flow of 15 kg/s, when the aircraft is flying at 260 m/s at an altitude of 7000 m. Assuming polytropic efficiencies of compressor and turbine = 0.87, Isentropic efficiency…
While doing a performance test on the air-conditioning system of a 2013 Chevrolet Malibu, the gauge readings are within specifications. The customer's complaint is that the discharge of air is warm. What other components can cause this problem?
A technician is diagnosing an air-conditioning system. With the manifold gauge set connected and the system stabilized, the gauges indicate readings lower than specifications on the low side. The technician also notices heavy frost on the inlet of the expansion valve. What can be the cause of…
Air at 20ºC and 1 atm flows at 5 m/s past a flat plate. At x = 60 cm and y = 2.95 mm, use the Blasius solution to find the following. Determine the wall shear stress at the specified location.
Air at 20ºC and 1 atm flows at 5 m/s past a flat plate. At x = 60 cm and y = 2.95 mm, use the Blasius solution to find the following. Determine the velocity u at the specified location.
Air at a density of 0.1 lbm/ft³ is flowing in the duct of a pitot tube. The pressure-difference gauge indicates a difference of 0.5 lbf/in². What is the air velocity?
Technician A says that fuel tanks are completely sealed and made from materials that allow it to fully expand and collapse according to changes in fuel tank pressures. Technician B says that modern fuel systems vent fuel vapors into a charcoal canister. Which technician is correct?
SUBJECT: Fluid Drive System Both pneumatic and hydraulic systems are important in particular applications. Explain two (2) situations where a hydraulic system is better to be applied and another two (2) situations where a pneumatic system has more advantages. Write two (2) examples of…
A house with a well pump gets groundwater at a temperature of 50°F. The 55-gallon hot water heater is set to maintain water at 120°F. A typical "hot" shower is 100°F - not much above skin temperature. If the hot water heater isn't heating the water (maybe due to a power outage), but the tank…
As you know from the behavior of a nozzle, when a fluid like air is accelerated, the pressure drops. This is exploited in racecars. The air is channeled under the vehicle at the front like a nozzle and then returned to ambient pressure at the rear with a diffuser. For a formula one car…
I am writing a lab report on the specific heat ratio for an ideal gas. Could you give me a summary of what the specific heat ratio of an ideal gas is and how can you experimentally determine it?
A mechanically fastened joint subjected to tension has a total member stiffness of km = 378 * 10^6 lbf/in, bolt stiffness of kb = 3.69 * 10^6 lbf/in. If the joint is held together with a ½ in – 20 UNF x 1 ½ SAE 5 bolt and subjected to an external load of P = 5678.9 lbf, determine the…
a) Derive the Bernoulli equation and discuss its applications and limitations. b) Discuss on the typical devices for measuring flowrates in pipe. Derive the equation of finding theoretical volume flow rate using continuity and Bernoulli equations. Justify if the results would be the…
Determine the thickness (mm) of a spur gear tooth with a diametral pitch of 7.64, measured along the pitch circle.
Two gears in a 3:1 ratio gearset and with a diametral pitch of 6 are mounted at a center distance of 11 in. Find the number of teeth in the gear (Ng).
At a given point on the surface of an airfoil at low speed, the pressure coefficient is -0.175. Use MATLAB to generate a Cp vs M plot for M = 0.5 - 0.8 in increments of ).05. Make sure to include labels and grids on the plot.
A DC motor is specified to have a stall torque, Tstall of 10 in-lbf and a no-load speed, ωNL = 100 RPM. a. What is the maximum power output of this motor in in-lbf/s? In Horsepower? In Watts? b. What is the equation of torque, T, in terms of angular speed, ω?
When an HVAC unit is switched on, it supplies 2,750 ft³ of air at 46°F DB and 100% RH to a 9,000 ft³ room. The air in the room is at 82°F DB and 60% RH prior to the HVAC unit being switched on. After all the supply air is in the room, what is the relative humidity in the room? Assume that…
can you derive the formula for efficiency regarding the diesel cycle
can you derive the formula for efficiency regarding the Brayton Cycle
The tension in the guy wire AB is 10 kN. The sum of the tension forces in AB and BC, acting on the column at B, is vertical. Find this sum.
A beam of uniform rectangular section 200 mm wide and 300 mm deep is simply supported at its ends. It carries a uniformly distributed load of 9 kN/m run over the entire span of 5 m. If the value of E for the beam material is 1 x 10^4 N/mm^2, find the slope at the supports and maximum…
A prime mover applies a torque of 500 in-lbs to a hydraulic pump running at 2000 rpm (pump efficiency is 85%, meaning that only 85% of the input mechanical power is converted into hydraulic power). The pump is pushing the fluid (S.G = 0.8, Kinematic Viscosity = 1 St) through a steel pipe (ID =…
In a meat processing plant, 2-cm-thick steaks (k=0.45 W/mâ‹…K and α=0.91×10−7 m2/s) that are initially at 25∘C are to be cooled by passing them through a refrigeration room at −11∘C. The heat transfer coefficient on both sides of the steaks is 9 W/m2â‹…K. If both surfaces of the…
4-10M: The kinematic viscosity of a hydraulic oil is 0.0001 m^2/s. If it is flowing in a 30 mm inside diameter pipe at a velocity of 6 m/s, what is the Reynolds number? Is the flow laminar, turbulent, or in transition? 4-14M: For the system in Exercise 4-10M, find the head loss due to friction…
Draw and explain the different modes of failure of a composite depending on the type of loading in relation to the orientation of the fibers (longitudinal traction, longitudinal compression, transverse traction, etc.
A large vessel vents when the enclosed air (R = 287 J/kgK and γ = 1.4) reaches a pressure of 25 bar and a temperature of 400 K. The venting system can be approximated by a pipe 6 m long and 20 mm in diameter, followed by a choked convergent nozzle with a throat diameter of 12 mm. The friction…
What are best innovation for coffee grinder machine? (Apply Mechanical engineering)
What pathway does HR creates to ensure that Maintenance Repair and Overhaul (MRO) standards are aligned, adhered to, and properly executed?
What strategic role does HR play in an aviation Maintenance Repair and Overhaul (MRO) for its business development?
Write a text explaining the procedure on measurement of the fracture toughness in ceramics. Why are the techniques for metals are incompatible with fracture toughness measurement on a ceramic?
Determine the heat transfer by convection over a surface of 0.75 m^2 if the surface is at 20 °C and the fluid is at 80 °C. The value of convective heat transfer is 25 W/m^2 °C.
A 90-hp (shaft output) electric car is powered by an electric motor mounted in the engine compartment. If the motor has an average efficiency of 91 percent, determine the electrical power supply to the motor at full load. The answer is 73.8 kW.
The free-rolling ramp has a mass of 60 kg. The crate whose mass is 40 kg slides from rest at A, 4.5 m down the ramp to B. Determine the ramp's speed when the crate reaches B. Assume that the ramp is smooth, and neglect the mass of the wheels.
i. Explain the terminology of CNC turning. (Minimum 15 sentences) ii. Explain the terminology of CNC milling. (Minimum 15 sentences)
Discuss the technology roadmap to digital watches, and the target market(s), and describe the technology, and the enabling technologies. Was this product created by a technology push or a market pull? (Kindly include correct in text citations and reference (links if gotten from website)
Discuss the technology roadmap to smartwatches, and the target market(s), and describe the technology, and the enabling technologies. Was this product created by a technology push or a market pull? (Kindly include correct in text citations and reference (links if gotten from website)
In a combined cycle natural gas-fired gas turbine power plant, the inlet temperature of a gas turbine is 815.56°C. It has a pressure ratio of 6:1. The exhaust gas leaves the gas turbine at 535°C. For the exhaust gas, the constant pressure specific heat is 0.26 kcal/kg-K and the constant…
A gas in a piston-cylinder device is compressed such that the pressure-volume trajectory follows a polytropic path, p1V1^n = p2V2^n. The subscripts 1 and 2 indicate the beginning and end of the process. Where n = 1.3. If the initial pressure is 1 bar and the initial volume is 1 m^3, and the…
Select the "incorrect" statement for the process equipment. Select one: A. They are used in the processing of raw materials B. Used to accomplish unit operations C. Used to transport fluids D. Used to accomplish unit processes E. None of the above
The volume of an object with curved surfaces will be measured by immersing it in water. The diameter of the cylindrical vessel containing the water was measured as 100 mm +/- 0.1 mm. The increase in the water level was measured as 10 +/- 1 mm. (pi number is used as 3.14). What is the volume of…
In a steam power plant, the steam turbine develops 1 MW. The heat supplied to the steam in the steam boiler is 2800 kJ/kg. The heat rejected to the cooling water in the steam condenser is 2100 kJ/kg and the boiler feed pump power is 5 kW. What is the mass flow rate of steam in kg/s?
Air enters a gas turbine compressor at a temperature of 300 K and a pressure of 100 kPa, and exits at a temperature of 660 K and a pressure of 950 kPa. Before entering the turbine, there is a heat transfer of 750 kJ/kg to the air. a) Wk=? b) η=? (It will be assumed that the cycle works…
Text: Design and development of phase change material Refrigerator Compartment for Household Applications. 1. Introduction and literature review 2. Design specifications 3. Design criteria 4. Design concepts (detailed description and functionality of each alternative…
Idea: Creating a convergent-divergent nozzle profile for Mach 1.4 supersonic flow. Guidelines: Give a complete background about the supersonic flow over nozzles and diffusers and the expected flow properties in both cases. Focus should be on nozzle design procedure and associated theories…
Design a concept to fill a sugar packing machine with a 50 kg bag using AutoCAD or Solidworks. Processes for the machine: - Worker places bag stack - Robot arm opens bag - Valve opens to fill bag - Robot arm sews bag - Robot arm scans bag for metal dust - Bag is then moved to a lorry by…
Lab Experiment SCOPE: The object or intent of the particular lab/experiment is to be stated. The main theme for each lab/experiment is to be stated. The following should be observed and stated: 1. PROCEDURE: Outline the steps that were followed to conduct this lab/experiment. Limit this to…
A siphon is used to draw water from a tank. The arrangement is shown in Fig. E. 6.19. Calculate the flow rate and pressure at point 2. The frictional loss equals 40 V2/2g. Atmospheric pressure is 10.2 m of water.
E 6.15. A jet directed at 30° reaches a maximum height of 3 m at a horizontal distance of 18 m. Determine the issuing velocity of the jet. (16.9 m/s)
The Cathedral and the Bazaar is a collection of essays originally meant for programmers and technical managers, written by Eric S. Raymond on software engineering methods. a) State FIVE (5) differences between cathedral and bazaar. [10 Marks] b) Microsoft is still at the forefront for many…
Calculate the height to which the jet, issuing at 18.8 m/s will rise when (i) The jet is directed vertically (ii) when it is directed at 45°. Also find the horizontal distance travelled in this case.
The diameter of a water jet at the nozzle exit is 75 mm. If the diameter at a height of 12 m is 98.7 mm when the jet is directed vertically, determine the height to which the jet will rise.
A tissue-engineered heart valve is mechanically loaded in a physiological salt solution (pressure = 0 MPa). The response of the fibroblasts depends on the mechanical load that the tissue senses. For this reason, knowledge of the exact stress history is vital. A strain of 4% is imposed in…
Sketch within a cubic unit cell the (123) and (130) planes.
Within a cubic unit cell, sketch the [103] and [122] directions.
A shaft with a diameter of 100 mm will be manufactured. The standard deviation of the shafts produced with the quality control was calculated as ± 0.1 mm. This shaft will rotate inside a bearing hole slightly larger than 100 mm in diameter. Accordingly, what should be the minimum hole diameter…
Write the result of the expression y = 10.2 / 2 with the uncertainty.
The long side of a rectangular area is measured at 100 m ± 10% and the short at 4 m ± 1%. What is the uncertainty of the area with a nominal value of 400 m2?
A horizontal pipe carrying water is gradually tapering. At one section the diameter is 150 mm and flow velocity is 1.5 m/s. (i) If the drop in pressure is 1.104 bar at a reduced section determine the diameter at the section. (ii) If the drop in pressure is 5 kN/m2, what will be the diameter?…
describe the structural properties with reference to material properties of metal, using non metal carbon
describe the structural properties with reference to material properties of metal using copper.
It is important for a materials engineer to have the ability to select the right material when designing a product. If you can identify the right material to use and justify why you chose that material for the product, then you have shown that you really understand this subject well. A car is…
Can you send me the bearing catalog values and also the C10 catalog values directly?
Please write a one-page paper on the following question: Many suggest that a scarce item in the future will be water. If you could think of an inexpensive way to get water from places of abundance to places where it is needed for drinking, farming, and other uses, such as fracking, you could…
A Francis turbine has a net head of 60 m at the inlet and operates at 420 RPM. The outer diameter of the turbine is 0.9 m and the inner diameter is 0.45 m. It is known that the flow rate at the turbine inlet and outlet is constant. Since the hydraulic efficiency of the turbine is 80%, the…
A centrifugal pump pumps water between two tanks open to the atmosphere. There is a height difference of 90 m between the upper tank and the lower tank, and there is a total loss of load (friction + local) of 15 m in the system. The blade width at the pump inlet and outlet is the same and is…
Given specific magnitudes of P 1 =390 N 1 P 2 =298 N 1 L 1 =3 m, L 2 =2 m, L 3 =2 m determine the vertical reaction at the left hand beam support. Give your answer, with the correct sign, rounded to the nearest whole Newton. Include the units for your answer.
A proposed space station includes living quarters in a circular ring 61.5 m in diameter. At what angular speed should the ring rotate so the occupants feel that they have the same weight as they do on Earth? It takes 2.20 s for a small ball with a mass of 0.130 kg released from rest from a tall…
A child on a sled (m = 47.0 kg) slides down a long hill starting from a rest position at a point 10.0 m higher in elevation than his finishing point. a) What is the total mechanical energy present? b) Assuming that there's no friction and no external pushes, determine the child's speed at the…
As the velocity of an inertial frame of reference increases with respect to a stationary observer, Einstein's theory of special relativity predicts that the length of an object, measured in the dimension parallel to the motion of the reference frame, will A. decrease B. remain unchanged C.…
A 30-caliber rifle with a mass of 2.94 kg fires a 7.33- g bullet with a speed of 656 m/s with respect to the ground. What kinetic energy is released by the explosion of the gunpowder that fires the bullet? (Note there is a tolerance 0.1 percent for the answer) ____A 8.65- g bullet from a 9-mm…
A 68-kg ice hockey player standing on a frictionless sheet of ice throws a 5.0-kg bowling ball horizontally with a speed of 3.4 m/s. With what speed does the hockey player recoil? An MSU linebacker of mass 112.0 kg sacks a UM quarterback of mass 86.0 kg. Just after they collide, they are…
If you have an object hitting a stationary object of equal mass in an inelastic collision, what will happen?
A 0.145- kg baseball traveling 38.30 m/s is stopped in 0.193 s by a catcher's mitt. What is the average acceleration of the ball? ____What is the average force on the catcher's mitt? ___A 0.145- kg baseball with an initial speed of 24 m/s rebounds with a speed of 35 m/s after being struck with…
State the orbital angular momentum of an electron in the following orbitals: a. 4d b. 3p
What is the momentum (in kg m/s) of a 99- kg football player running at a top speed of 9.9 m/s? What is the momentum of a 8.92- g rifle bullet traveling at 738 m/s? ______A croquet mallet delivers an impulse of 8.37 N s to a 0.39- kg croquet ball initially at rest. What is the speed of the ball…
Answer the following questions. a.) If a tuning fork with a frequency of 440 Hz is tapped together with the guitar strings strung, how many frequencies are there from the guitar strings? b.) If the same tuning fork from a.) is tapped and playing the trumpet at 446 Hz, find the frequency heard…
The car approaches Mr. Ronaldo in a straight line with a speed of 50 m/s, emitting sound waves with a frequency of 1,000 hertz. (Set the speed of sound to be 350 meters per second.) a.) If Mr. Ronaldo stands still, what frequency will Mr. A hear from the car? b.) As the car passes by, what…
A solid sphere is rotating about an axis that passes through its center, and so is a thin-walled spherical shell. They have identical masses, radii, and kinetic energies. The angular speed of the shell is 6.54 rad/s. What is the angular speed of the solid sphere?
An arrow is shot from a bow vertically upwards. Neglecting air drag, after leaving the bowstring, what is the arrow's acceleration?
Why is Compton scattering normally performed with X-rays and not visible light?
A simple pendulum of mass 0.275 kg is tied to a light rope 1.10 m long and pulled so that the rope is at an angle of 5 degrees to the vertical. Let it start swinging from a standstill so that the pendulum oscillates at an angular frequency of 2.97 radians/second. a.) Find the magnitude of the…
A jogger runs at 4.0 m/s for 1000 m, stops at lights for 50.0 s as they change, then runs at 3.0 m/s for a further 1500 m home. What was her average speed?
The density of the thin rod of length l increases uniformly from λ at one end to 2λ at the other end. Determine the moment of inertia about an axis perpendicular to the rod through its geometrical center.
What are the biological, microscopic, and macroscopic effects of acute, high-dosage, ionizing radiation exposure on the human body? Describe what occurs within the cells. Which cell types are most affected by acute radiation exposure? What are the macroscopic effects of damage to these cells?…
In an alloy consisting of 12.8% metal A and 87.2% metal B by weight, the weights of metals A and B are 61.4 g/mol and 125.7 g/mol, respectively, and densities of 4.27 g/cm^3 and 6.35 g/cm^3, respectively. If the edge length of the unit cell of this alloy is 0.395 nm, determine whether the…
Consider two circuits with resistors in series and in parallel. In each case the applied voltage is 12 V and the current is 12 mA. a. What is the value of each resistor when they are in series assuming R1 = R2 = R3? b. What is the value of each resistor when they are parallel assuming R1 = R2 =…
A child is riding a merry-go-round that is turning at 10 rpm. If the child is standing 4 m from the center of the merry-go-round, how fast is the child moving? 4.19 m/s 1.80 m/s 0.556 m/s 5.64 m/s 3.50 m/s
An object is placed at the origin. A lens of focal length, f, is placed at X=30 cm. A lens with a focal length of -20 cm is placed at x=35 cm, and a lens with a focal length of 10 cm is placed at x=43 cm. An image of the object is projected onto a screen located at X=57.7 cm. Determine the…
A fireman slides down a fire pole in his station at a constant speed. We know: a. the net force acting on him is zero. b. there are no forces acting on him. c. he is accelerating. d. he is decelerating.
weight of 800 N is hung from a spring with a spring constant of 2000 N/m and lowered slowly. How much will the spring stretch? 4.00 cm 40 cm 6.00 cm 20.0 cm 12.0 cm
Calculate the sedimentation velocity of a lead sphere with a diameter of 20 micrometers in still air. The density of lead is 11,300 kg/m^3, and the viscosity of air is 1.81 x 10^-5 kg/m.s.
4.0 J of work are performed in stretching a spring with a spring constant of 2500 N/m. How much is the spring stretched? 3.2 cm 5.7 cm 5.0 cm 0.3 cm 3.2 cm
Shown are 2 positive 30C charges on opposite corners of a 10cm x 10cm square. What charge needs to be placed at the top right empty corner so that the net electric field is zero at the bottom left corner, point P? Be sure to both state the size of Q's charge and whether it is positive or…
The speed of the Airbus A340 plane is 190 km/h. The coefficient of friction between its wheels and the tarmac is 0.08. The braking system of the plane and the air drag combined are able to decrease the speed at a rate of 0.6 m/s². What is the safe length of the runway?
There is a steady water flow in a pipe. Pressure at point (1) is 300 kPa and at point (2) 100 kPa. Calculate pipe diameter at (2), when velocity at (1) is 19.7 m/s and the flow can be assumed frictionless. Round off the answer to three decimal digits in m, but enter your answer without the…
Two particles with angular momentums L1 = 1 and L2 = 2 . A) Find the expected total angular momentum . B) How many independent state exist in the coupled representation . C) Write the coupled state | 3 2 > as linear combination of the uncoupled states and find the Clebsch-Gordan coefficients .
What is the difference in electric potential, between points A and B? (b) What is the difference in electric potential, , between points B and C? (c) What is the difference in electric potential, , between points C and A? (d) From the information given in this problem, is it possible to…
Calculate the angle of refraction when a light ray strikes a water/glass interface at an angle of incidence of 32.5°.
What steps and information are needed for an organization to incorporate grant seeking and proposal writing into its fundraising operations? What are the necessary elements to build a long-term partnership with a foundation?
Question 1A: A 2-kg object moving at 1.5 m/s collides with and sticks to a 1-kg object initially at rest. Determine the speed (in m/s) of the system as a result of this collision. 2.0 3.0 2.3 1.0 Question 2A: A bat strikes a 0.145-kg baseball. Just before impact, the ball is traveling…
A 0.2 kg hockey puck, sliding on an outdoor rink, has a velocity of 10 m/s [forward] when it suddenly hits a rough patch of ice that is 3 m long. Assume that the coefficient of kinetic friction between the puck and the rough ice is 0.47. Calculate the magnitude of the force of kinetic friction…
A binary system consists of two stars that revolve in a circular orbit about a center of mass midway between them. Assume the orbital speed of each star is 220 km/s and the orbital period of each star is 14.4 days. Find the distance between the two stars. Find the mass M of each star.
Determine the velocity potential of the (2-D) flow due to a moving circular cylinder with velocity U in the positive x-direction by means of the method of separation of variables. Take the radius of the cylinder as “a” and compare your analytical result with the result obtained by using…
Does the "s" orbit split due to spin-orbit interaction just like the " p" orbit and how ?Does the "d" orbit split due to spin-orbit interaction just like the " p" orbit and how ?
22. An exploration vehicle is located in the floor of a sea at a depth of about 2, 200 m below the surface of the water. The density of seawater is (a) What is the pressure at this depth? (b) What force would the water exert on the vehicle's observation window ?
What is the force (in N) acting on an electron at a point 1.6 nm from a nucleus with atomic number Z = 80?
A proton accelerates along the line joining the two charges of a dipole, away from the dipole. The dipole is made up of two charges, both 60 nC in magnitude, separated by 0.5mm. What is the proton’s speed when it is 1cm away?
Show that forward difference is a first order accurate scheme. Using forward and backward difference, show that central differencing is a second order accurate scheme.
Sarah and her friends went to enchanted kingdom to try a newly opened roller coaster with an empty cart of mass 120 kg. A part of the ride is a vertical loop with radius 12 meters. At the bottom of the loop, the cart has a velocity of 25 m/s, while 8 m/s at the top. As the cart rolls from…
Mrs. Santos weighing 61 kg steps on a bathroom scale that contains a stiff spring. In equilibrium, the spring is compressed 1 cm under her weight. What is the force constant of the spring and the total work done during compression?
A 3.15 kg weight was hanged on the tip of an ideal spring with negligible mass which is measured to be 13.40 cm long. What would be the total length of the spring if we wanted a 10 J potential energy in the spring considering that it's initial length is 12 cm when nothing is attached to it.…
Two coaxial metal cylindrical tubes, of radius a and b > a, represent a cylindrical cable. The inner conductor at a carries a linear charge λ and the outer conductor at b is grounded. Assume an arbitrary length L. a) Determine the electric field in the region between the two conductors. b)…
A pilot was assigned to MH730, which is an Airbus with four engines. Each of the jet engines develops a thrust (forward force on the airliner) of 72,000 lb when the airplane is flying at 250 m/s. What horsepower does the engine develop?
There is a 20kg block that lies on a triangular block that is inclined at an angle of 30 degrees. a) What force parallel to the ramp would prevent the block from moving (assuming that 1kg exerts a force of 9.8N)? b.) What is the force of gravity (Fg) acting on the block?
An electron beam is emitted from a cathode (z=0) to an anode (Z=L) at distance L, with a radius d such that d << L. N is the number of electrons per second in the beam. dV is the potential between the anode and cathode. Treat the anode and cathode as a point/sink connected in a circuit with a…
The laws of physics are the same in all inertial frames of reference, but the "twin paradox" states that the traveling twin will experience time dilation and be younger than the other twin upon returning to Earth. How are both of these statements correct?
An electron is moving to the left in a magnetic field pointing towards the top of this page. What direction is the resulting force on the electron? Answer options: into page, toward the top of the page, out of the page, toward the bottom of the page, none of these are correct.
A perimeter fence around a dangerous device has a height of 1325 mm. The dangerous device has a height of 2150 mm, and the horizontal distance from the device to the fence is 550 mm. The company policy specifies that all perimeter fences can be designed using the standard specifications.
Outline an important factor to determine the notch toughness of a metal in impact test.
Define reverse engineering. What is the function of the (a) hardware and (b) software systems in reverse engineering? Are there any ethical or legal issues that may arise when using reverse engineering? Describe three ways in which a company can apply reverse engineering to its own…
hello I'm having difficulty in thermodynamic mainly due to finding these formulas Ur using . for Q the heat u r using various different formula's some have voltage current and other have work and whatever . is there any place I can find the list of all these formulas used in thermodynamics it…
An elevator is designed to travel a height of 4.5 meters when loaded and will have a maximum gross weight of 250 kg. A coil spring is provided below to absorb shock in the event that the elevator should fall freely because of sudden breakage of the wire rope carrying it. If the coil spring is…
the rotor of an electric motor has a mass, m, 180 kg and a radius of gyration, k, 150 mm. Calculate the torque required to accelerate it from rest to 1,500 revs/min in 8 s. Neglect friction.
Consider the purely subsonic flow in a convergent-divergent duct. The inlet, throat, and exit area are 0.90 m^2, 0.60 m^2, and 0.75 m^2, respectively. If the inlet Mach number and pressure are 0.4 and 7000 N/m^2, respectively, calculate M and p at the exit.
The drawing shown below is a representation of a redesigned stepped bar component utilized in a field cultivator employed in the farming industry to prepare soil for planting. The stepped bar consists of a 21 mm square section bar (AB) of length 45 mm; a 15 mm diameter bar (BC), length 60 mm;…
Consider a gas with a specific heat ratio of 1.48 at the Mach number of 6.5. Determine the strength (the pressure ratio across the shock, p2/p1) of the normal shock.
For a given Prandtl-Meyer expansion, the upstream Mach number is 3.8 and the pressure ratio across the wave is p2/p1 = 0.5. Calculate the turning angle, θ, in degrees (°) relative to the free-stream direction.
At a point in the flow over a high-speed missile, the local velocity and temperature are 1000 m/s and 300 K, respectively. Calculate the Mach number M and the characteristic Mach number M* at this point.
An engine valve spring having 12 coils has the ends squared and ground. The outside diameter of the coil is 110 mm and the wire diameter is 11 mm. It has a free length of 180 mm. A. Determine the length of the wire to which this spring must be initially compressed to hold a bolt pressure of…
10.14 A pair of gears for a hoist have the following specifications: 20° full-depth involute teeth; o. pinion = 80 MPa; o. gear = 55 MPa; pinion has 20 teeth; gear has 80 teeth; and pinion transmits 5 kW at 200 r/min. Determine (a) the standard module and face width which will satisfy these…
10.11 The following data relate to a spur gear drive: Power transmitted by the motor pinion = kW at 750 r/min; gear ratio = 3,5; teeth 20° stub involute; starting torque = 130% of torque rating; 18 teeth on pinion; pinion and pear made of 1 he same material (0. = 250 MPa); motor shaft = 45 mm…
The Incoming wind at 1 bar, 20°C and 12 m/s is swept along a wind turbine of 2 blades of 50 m diameter. If the air velocity at the turbine downstream is 8 m/s, calculate the axial thrust on the wind turbine axis.
Need help, please! How to Optimize Mechanical Properties of Materials Composites through their Microstructure with Articles as References.
4) 2 kg of Refrigerant 134-a is contained in a constant volume tank as a saturated vapor. When it is heated, the refrigerant pressure and temperature become 400 kPa and 50°C, respectively. Determine the change of entropy of the refrigerant during this process. If the heat transfer is coming…
I am looking to design a gear system in order to move a door upwards 2.25 inches. To do so I am using a rack and pinion system, where the rack is connected to the door and half of the rotation of the gear should cause the rack to more the 2.25 inches in one direction. What dimensions of the…
Determine the overall yield of a production line of 100 stations, each with a 99% yield? explain with formula Give two top differences between Lean Six Sigma, and defect based Six Sigma (one sentence each).
A closed, rigid tank is filled with water, initially at saturated liquid at 140°C. Water is then heated until the temperature reaches 200°C. Determine the heat transfer in kJ/kg.
A compact car with a mass of 1,200 kg and a drag coefficient of 0.4 uses 30-cm-radius radial tires and has a 3.2-reduction differential. The engine of this car develops a torque of 235 N-m at 3,500 rpm, and a power of 110 kW at 5,500 rpm, with a transmission efficiency of 0.9. If this car can…
A 2m x 2m x 2m furnace is made out of 10mm mild steel. It is aligned with 100mm fire brick clay. What is the heat storage of the complete furnace if the inside of the furnace is 1650°C? Make assumptions on required information.
Is the accuracy of a CMM equipped with a touch probe going to be affected by the diameter of the probe tip?
I have a question about retaining the structure of a material. I'm working on a project at the moment and I was wondering if there are ways to laminate cylindrical objects through a desktop laminator. The key idea is for it to remain cylindrical after lamination. I've tried inserting some…
The task of estimating water needs is complicated by conflict between current practice and conservation. Simple conservation methods such as flow control and partial recycling of water can reduce daily usage by a 5% and 10%, b 10% and 20%, c 20% and 40%, d 25% and 50%.
What is most nearly the moment of inertia of a rectangular 46 cm x 61 cm beam installed in its strongest vertical orientation?
What rod end pressure (in psi) is required to decelerate the 3 cylinder to 60 ft/min to zero velocity in 1/4 in. at the end of the extension stroke? Assume that the rod diameter is 1 in.
Which of the following would permit you to find the portion of vector A which is parallel to vector B? Group of answer choices: a unit vector in the direction of A, the magnitudes of vectors A and B, a unit vector in the direction of B, the magnitudes of both A and B, and the product A dot B.
An experiment is to be conducted to determine heat transfer coefficient on the surfaces of tomatoes that are placed in cold water at 7 [Degree Celsius]. The tomatoes (k=0.59 W/(m*K), alpha=(0.141*10^-6) m^2/s, p=999kg/m^3, Cp=3.99KJ/(kg*K)) with an initial uniform temperature of 30 [Degree…
The coefficients of static friction at the contacting surfaces are µA = 0.25, µB = 0.34, and µC = 0.39. The 100 kg roller (solid) and 40 kg tube (hallow) both have a radius of 150 mm. Determine the maximum amount of friction force that can act at point C before slippage occur. Answers are: 455…
If the coefficient of performance for a refrigerator is QL/W and the COP is QH/W for a heat pump, how do these measures of efficiency differ? (a) only in the heat goal (b) L and H don't matter (c) they are always less than a heat engine (d) they are the same.
Generally, _____________ is taken off by the square foot for surface area, linear foot for pipe insulation, and by the individual piece for fittings or doors.
The coefficients of static friction at the contacting surfaces are μA = 0.25, μB = 0.34, and μC = 0.39. The 100 kg roller (solid) and 40 kg tube (hollow) both have a radius of 150 mm. Determine the maximum amount of friction force that can act at point C before slippage occurs.
Which of the following is (are) NOT considered as an inspection? Explain. [5] a. Checking the gas consumption of a vehicle before it is shipped to a customer b. Checking the accuracy of a sensor before it is shipped to a customer c. Checking the paint color and smoothness of a car body d.…
Solve both A) An inventor claims that a new heat cycle will develop 0.4 kW for a heat addition of 32.5 kJ/min. The temperature of heat source is 1990 K and that of sink is 850 K. Is his claim possible ? B) Steam at a pressure of 5 bar passes into a tank containing water where it gets…
Reanalyze the bone in Exercise 6.2 assuming that Mp/R is proportional to the radial gradient of stress. Assume that a positive stress gradient produces resorption (Mp/R < 0) and a negative stress gradient produces formation (Mp/R > 0). (A positive stress gradient is defined as one in which the…
An external spur gear with a pitch angle of 20° has a diametral pitch of 3. The spur gear drives an internal gear with 75 teeth to produce a velocity ratio of 1/3. Determine the center distance.
Reanalyze the bone in Exercise 6.2 assuming that Mp/R is always formative and proportional to the magnitude of the longitudinal surface stress. How does the shape of this new bone distribution compare with that seen in Goodship's pig osteotomy experiment (Fig. 6.8B)? Discuss how the shape of…
You are at the top of the Mount Everest whose height is 12,000 ft. Find the gravity force generated by you (80kg) using the provided equation of the attraction force in N?
The power generation company "Luz del Norte" has a Francis turbine operating with a net head Hn of 54 m and a flow rate Q of 9 m^3/s, rotating at a speed N of 300 RPM. The diameters corresponding to the inlet and outlet sections of the runner are, respectively, D1 = 1.5 m and D2 = 0.8 m. The…
11-33 A plant manager has to choose between replacing five 4-hp standard motors and replacing one 20-hp standard motor with high-efficiency counterparts. The existing efficiency of the small motor is 0.83, and its replacement has an efficiency of 0.89. The efficiencies of the existing large…
The Reynolds number, Re, is a very important parameter in fluid mechanics. Determine its value for water flowing at a velocity of 2m/s through a 20cm diameter pipe
Nitrogen flows at a velocity of 54 m/s into the inlet of a 10.2 cm pipe. The pressure and temperature at the inlet are 301.5 kPa and 24 °C, and at the outlet, they are 183 kPa and 18 °C. The gas constant for Nitrogen is 0.2968 kJ/kg/K, the specific heat is 1.039 kJ/kg/K, and the density is…
0.6 m3 Argon is contained in a piston-cylinder device at 1.2 MPa. Argon now expands until the volume triples and pressure halves. The gas constant for Argon is 0.208 kJ/kgK. Find the work from/to the spring within 4 sf and appropriate units.
18.7 If the air from the end of the pipeline of Problem 18.6 is delivered through 60 ft of 1 1 2 -in. hose to a rock drill that requires 120 cfm of air, determine the pressure at the drill. Change the size of the pipe, fittings, and valves to 5 inch
k = 1.4, R = 287 J/kgK and Cp = 1004 J/kgK. Air at a stagnation pressure of 1000 kPa and stagnation temperature of 700 K enters (via a Laval nozzle with an exit to throat area ratio of 1.38 preceding the duct) a constant area duct with heat addition of 800 kJ/kg. (a) Show that if the flow…
3 ft^3/sec of moist air at 90°F, 14.7 psia, and 100% relative humidity enter an air conditioning unit and is to leave at 14.7 psia and 60°F with a relative humidity of 40%. Any liquid water that must be extracted or supplied will be at 40°F. Steady-state conditions exist.
Solve the eigenvalue problem for the fixed-pinned beam. Then, numerically determine the first four modes and sketch the mode shapes
The pipe coming out of the pump is experiencing excessive vibrations. The pipe can be modeled as an SDOF system. The stiffness can be calculated by measuring the deflection (1 cm) when a force of 200 N is placed on the pipe. Additionally, a push test (pushing the pipe and letting it vibrate)…
In order to augment the rate of cooling of a device, a pin fin of 2.5mm diameter is attached to its casting. The wall of the casting has a temperature of 95°C, whereas it has a temperature difference of 70°C with the surrounding air. Primarily, the heat transfer occurs through natural…
Assume that a system must operate 40 hours per week, 50 weeks per year, for 15 years, in response to a designated customer need. The system MTBF is 400 hours, the average MCT is 2 hours, and 2 maintenance technicians are assigned for the duration of each maintenance action. Determine the MLH/OH…
Ferrite steel is often used as the material for a reactor pressure vessel. After 40 years of service, it was found that Cu-rich clusters or precipitates are generated in the alloy. These precipitates can act as pinning points for mobile dislocations. The density of the precipitates is 1×10^15…
Consider an uninsulated wire with a diameter of 1 mm generates electrical heating at the rate of 2 W/m^2 when it hangs in air. The temperature difference between the wire and the ambient air is 25°C. To cover the wire with an electrical insulation, the thermal engineers consider using a…
Suppose a force is described as {30i - 40j + 20k} N using the Cartesian vector representation. What is the magnitude of the force and the direction angle β (formed by the force and positive y-axis) respectively?
Solve the eigenvalue problem for the "fixed-free" uniform elastic rod in extension. The rod has density Ï, cross-sectional area A, elastic modulus E, and length L. Then, determine the first four modes and sketch the corresponding mode shapes.
The following expression represents the heat generation rate within a cylindrical fuel element for a gas-cooled nuclear reactor: q(r) = qo[1 - (r/R)^2](w/m^3). Where qo denotes a constant term and R shows the radius of the fuel element. Considering the outer surface of the cylindrical element…
We can model the crankcase of an automobile as a flat plate of 10 cm thickness, 60 cm length, and a 20 cm width. Consider the surface temperature of the crankcase is 77°C when the vehicle moves with a speed of 108 km/hr. Moreover, the vibrations of the engine and chassis cause the boundary…
During a quenching process, a 0.01 diameter and 0.2m long cylindrical rod made of 1080 Steel is heated to 750°C and then placed in water at 80°C. Considering a convection heat transfer of 250 W/m^2·K, how much time will the rod be at 300°C?
Design an extension coil spring to handle a dynamic load ranging from 275 at 325 N, during a working deflection of 10 mm. Use silicon chrome wire and standard hooks. The forced frequency is 800 cycles per minute. if you want life infinite. Determine the appropriate factors of safety against…
A compression coil spring is required to provide a variable force on the time to go from a minimum of 100 to a maximum of 300 lbs. in one working deflection of 1 in. It needs to work freely on a 1.25-in-diameter shaft. Use a cold-drawn carbon steel wire with a Sut = 250 ksi. You want an index…
A block of mass m = 8 is attached to a rigid pole of length L = 2 m. if the block has a velocity of 4 m/s as it travels through the horizontal, what is the distance between the blocks lowest and highest points? Neglect the mass of the pole. neglect air resistance and any frictional forces
Molecular weight refers to the length of a polymer molecule. t/f?
Using the equation WL^3/3EI for a simply supported aluminum beam, find the deflection. We know the beam is aluminum, it's 18.39 mm wide, 2.55 mm deep, 400 mm in total length, and a weight weighing 300 grams hangs directly in the middle of the beam. Find the aluminum beam's deflection in mm.
Consider the ODE given by: x''(t) + c x'(t) + k x(t) = r(t). For c = 1 and k = 4, plot the position and velocity over the time interval [0, 20] seconds for the following cases. Analyze and discuss each result. Compare the two results. 1) r(t) is zero, x(0) = 1, x'(0) = 0. 2) r(t) is zero, x(0)…
Given a shell and tube heat exchanger with a heat transfer fluid on the inner tube with a heat transfer coefficient h1 = 30 W/(m2 K) and a fluid on the outer side of the tube with heat transfer coefficient of h2 = 55 W/(m2 K ). The tube is made of stainless steel with a thermal conductivity of…
In the Gas Permeability test performed with a standard cylindrical sample, the time was measured as 58 seconds. Calculate the permeability value of the molding sand using the Gas Permeability formula.
In the Standard Cylindrical sample preparation step, you started with 158 g of sand. However, you did not achieve the desired height of 2 inches after 3 compression strokes. The sample ended up being shorter than expected. What should you do in this situation? Please provide detailed…
Why is flux (slag cleaner) added to liquid metal? Why does slag separate from metal? Is it possible to cast without removing the model from the mold? In what situations does this event give us an advantage? Please give detailed information. Thank you!!
calculate the test section Mach number from the measured oblique shock wave angle (wedge section aerofoil) the evolution of the flow over the wedge shall also be calculated.
What is a degree? Is it possible to mold without a degree? Indicate the importance of compression in the molding process. What casting elements should be placed outside the model of the part, including the degree, when molding the upper half of the model? Please give detailed information. Thank…
What are the main types of nuclear fuel geometry shapes? solution :Nuclear energy
A 5,100 ft3 air stream exits a heating unit at 80°F and 60% RH and then mixes with 28,000 ft3 of air at 70°F and 40% RH provided to the building from another source. What is the combined dry-bulb temperature of the air in the building? Note: there is no exhaust in this problem. The total air…
Q1) Transition from laminar flow to turbulent flow occurs when a) Reynolds number decreases b) Reynolds number is constant. c) Froude's number increases. d) Reynolds number increases. Q2) Cavitation is aggravated by utilizing liquids at high temperatures where their vapor pressure is high or…
A stepper motor is to be designed to meet the following requirements: → The stator must have 3 phases → The required full step size is 5° Determine the number of rotor poles.
The gas generator of a two-shaft gas turbine has a compressor pressure ratio of 5 and compressor and turbine inlet temperatures of 80°F and 2000°F, respectively, at sea level. All turbomachines have efficiencies of 90%, and the inlet air flow is 50 lbm/s. (a) What are the net work, pressure…
Water enters a 0.004 m diameter and 21 m long tube at 45ºC with a velocity of 0.5 m/s. What is the required length of the tube, in m, in order for the water to exit the tube at 25ºC if the tube is maintained at a constant temperature of 5ºC?
The feeder-selector system for Station #3 in your synchronous 6-station assembly machine has just suffered catastrophic failure and is not repairable. Luckily, your company has another similar feeder-selector system in storage, but the control parameters need to be recalculated to properly set…
10: The shaft is fixed to the wall at A and is subjected to the torques shown. Determine the maximum shear stress in the shaft (ignore stress concentration effect).
Explain why we can decouple (separate) the six equations of motion of an aircraft into three longitudinal equations and three lateral-directional equations. Which forces and moments contribute to each set of equations?
How much energy (units of BTU) does an HVAC heating unit need to add to 5,000 ft³ of air at 55°F and 70% RH in order to condition it to 80°F and 60% RH?
A simple turbojet is operating with a compressor pressure ratio of 8.0, a turbine inlet temperature of 1200 K and a mass flow of 15 kg/s, when the aircraft is flying at 260 m/s at an altitude of 7000 m. Assuming polytropic efficiencies of compressor and turbine = 0.87, Isentropic efficiency…
While doing a performance test on the air-conditioning system of a 2013 Chevrolet Malibu, the gauge readings are within specifications. The customer's complaint is that the discharge of air is warm. What other components can cause this problem?
A technician is diagnosing an air-conditioning system. With the manifold gauge set connected and the system stabilized, the gauges indicate readings lower than specifications on the low side. The technician also notices heavy frost on the inlet of the expansion valve. What can be the cause of…
Air at 20ºC and 1 atm flows at 5 m/s past a flat plate. At x = 60 cm and y = 2.95 mm, use the Blasius solution to find the following. Determine the wall shear stress at the specified location.
Air at 20ºC and 1 atm flows at 5 m/s past a flat plate. At x = 60 cm and y = 2.95 mm, use the Blasius solution to find the following. Determine the velocity u at the specified location.
Air at a density of 0.1 lbm/ft³ is flowing in the duct of a pitot tube. The pressure-difference gauge indicates a difference of 0.5 lbf/in². What is the air velocity?
Technician A says that fuel tanks are completely sealed and made from materials that allow it to fully expand and collapse according to changes in fuel tank pressures. Technician B says that modern fuel systems vent fuel vapors into a charcoal canister. Which technician is correct?
SUBJECT: Fluid Drive System Both pneumatic and hydraulic systems are important in particular applications. Explain two (2) situations where a hydraulic system is better to be applied and another two (2) situations where a pneumatic system has more advantages. Write two (2) examples of…
A house with a well pump gets groundwater at a temperature of 50°F. The 55-gallon hot water heater is set to maintain water at 120°F. A typical "hot" shower is 100°F - not much above skin temperature. If the hot water heater isn't heating the water (maybe due to a power outage), but the tank…
As you know from the behavior of a nozzle, when a fluid like air is accelerated, the pressure drops. This is exploited in racecars. The air is channeled under the vehicle at the front like a nozzle and then returned to ambient pressure at the rear with a diffuser. For a formula one car…
I am writing a lab report on the specific heat ratio for an ideal gas. Could you give me a summary of what the specific heat ratio of an ideal gas is and how can you experimentally determine it?
A mechanically fastened joint subjected to tension has a total member stiffness of km = 378 * 10^6 lbf/in, bolt stiffness of kb = 3.69 * 10^6 lbf/in. If the joint is held together with a ½ in – 20 UNF x 1 ½ SAE 5 bolt and subjected to an external load of P = 5678.9 lbf, determine the…
a) Derive the Bernoulli equation and discuss its applications and limitations. b) Discuss on the typical devices for measuring flowrates in pipe. Derive the equation of finding theoretical volume flow rate using continuity and Bernoulli equations. Justify if the results would be the…
Determine the thickness (mm) of a spur gear tooth with a diametral pitch of 7.64, measured along the pitch circle.
Two gears in a 3:1 ratio gearset and with a diametral pitch of 6 are mounted at a center distance of 11 in. Find the number of teeth in the gear (Ng).
At a given point on the surface of an airfoil at low speed, the pressure coefficient is -0.175. Use MATLAB to generate a Cp vs M plot for M = 0.5 - 0.8 in increments of ).05. Make sure to include labels and grids on the plot.
A DC motor is specified to have a stall torque, Tstall of 10 in-lbf and a no-load speed, ωNL = 100 RPM. a. What is the maximum power output of this motor in in-lbf/s? In Horsepower? In Watts? b. What is the equation of torque, T, in terms of angular speed, ω?
When an HVAC unit is switched on, it supplies 2,750 ft³ of air at 46°F DB and 100% RH to a 9,000 ft³ room. The air in the room is at 82°F DB and 60% RH prior to the HVAC unit being switched on. After all the supply air is in the room, what is the relative humidity in the room? Assume that…
can you derive the formula for efficiency regarding the diesel cycle
can you derive the formula for efficiency regarding the Brayton Cycle
The tension in the guy wire AB is 10 kN. The sum of the tension forces in AB and BC, acting on the column at B, is vertical. Find this sum.
A prime mover applies a torque of 500 in-lbs to a hydraulic pump running at 2000 rpm (pump efficiency is 85%, meaning that only 85% of the input mechanical power is converted into hydraulic power). The pump is pushing the fluid (S.G = 0.8, Kinematic Viscosity = 1 St) through a steel pipe (ID =…
In a meat processing plant, 2-cm-thick steaks (k=0.45 W/mâ‹…K and α=0.91×10−7 m2/s) that are initially at 25∘C are to be cooled by passing them through a refrigeration room at −11∘C. The heat transfer coefficient on both sides of the steaks is 9 W/m2â‹…K. If both surfaces of the…
4-10M: The kinematic viscosity of a hydraulic oil is 0.0001 m^2/s. If it is flowing in a 30 mm inside diameter pipe at a velocity of 6 m/s, what is the Reynolds number? Is the flow laminar, turbulent, or in transition? 4-14M: For the system in Exercise 4-10M, find the head loss due to friction…
Draw and explain the different modes of failure of a composite depending on the type of loading in relation to the orientation of the fibers (longitudinal traction, longitudinal compression, transverse traction, etc.
A large vessel vents when the enclosed air (R = 287 J/kgK and γ = 1.4) reaches a pressure of 25 bar and a temperature of 400 K. The venting system can be approximated by a pipe 6 m long and 20 mm in diameter, followed by a choked convergent nozzle with a throat diameter of 12 mm. The friction…
What are best innovation for coffee grinder machine? (Apply Mechanical engineering)
What pathway does HR creates to ensure that Maintenance Repair and Overhaul (MRO) standards are aligned, adhered to, and properly executed?
What strategic role does HR play in an aviation Maintenance Repair and Overhaul (MRO) for its business development?
Write a text explaining the procedure on measurement of the fracture toughness in ceramics. Why are the techniques for metals are incompatible with fracture toughness measurement on a ceramic?
Determine the heat transfer by convection over a surface of 0.75 m^2 if the surface is at 20 °C and the fluid is at 80 °C. The value of convective heat transfer is 25 W/m^2 °C.
A 90-hp (shaft output) electric car is powered by an electric motor mounted in the engine compartment. If the motor has an average efficiency of 91 percent, determine the electrical power supply to the motor at full load. The answer is 73.8 kW.
The free-rolling ramp has a mass of 60 kg. The crate whose mass is 40 kg slides from rest at A, 4.5 m down the ramp to B. Determine the ramp's speed when the crate reaches B. Assume that the ramp is smooth, and neglect the mass of the wheels.
i. Explain the terminology of CNC turning. (Minimum 15 sentences) ii. Explain the terminology of CNC milling. (Minimum 15 sentences)
Discuss the technology roadmap to digital watches, and the target market(s), and describe the technology, and the enabling technologies. Was this product created by a technology push or a market pull? (Kindly include correct in text citations and reference (links if gotten from website)
Discuss the technology roadmap to smartwatches, and the target market(s), and describe the technology, and the enabling technologies. Was this product created by a technology push or a market pull? (Kindly include correct in text citations and reference (links if gotten from website)
In a combined cycle natural gas-fired gas turbine power plant, the inlet temperature of a gas turbine is 815.56°C. It has a pressure ratio of 6:1. The exhaust gas leaves the gas turbine at 535°C. For the exhaust gas, the constant pressure specific heat is 0.26 kcal/kg-K and the constant…
A gas in a piston-cylinder device is compressed such that the pressure-volume trajectory follows a polytropic path, p1V1^n = p2V2^n. The subscripts 1 and 2 indicate the beginning and end of the process. Where n = 1.3. If the initial pressure is 1 bar and the initial volume is 1 m^3, and the…
Select the "incorrect" statement for the process equipment. Select one: A. They are used in the processing of raw materials B. Used to accomplish unit operations C. Used to transport fluids D. Used to accomplish unit processes E. None of the above
The volume of an object with curved surfaces will be measured by immersing it in water. The diameter of the cylindrical vessel containing the water was measured as 100 mm +/- 0.1 mm. The increase in the water level was measured as 10 +/- 1 mm. (pi number is used as 3.14). What is the volume of…
In a steam power plant, the steam turbine develops 1 MW. The heat supplied to the steam in the steam boiler is 2800 kJ/kg. The heat rejected to the cooling water in the steam condenser is 2100 kJ/kg and the boiler feed pump power is 5 kW. What is the mass flow rate of steam in kg/s?
Air enters a gas turbine compressor at a temperature of 300 K and a pressure of 100 kPa, and exits at a temperature of 660 K and a pressure of 950 kPa. Before entering the turbine, there is a heat transfer of 750 kJ/kg to the air. a) Wk=? b) η=? (It will be assumed that the cycle works…
Text: Design and development of phase change material Refrigerator Compartment for Household Applications. 1. Introduction and literature review 2. Design specifications 3. Design criteria 4. Design concepts (detailed description and functionality of each alternative…
Idea: Creating a convergent-divergent nozzle profile for Mach 1.4 supersonic flow. Guidelines: Give a complete background about the supersonic flow over nozzles and diffusers and the expected flow properties in both cases. Focus should be on nozzle design procedure and associated theories…
Design a concept to fill a sugar packing machine with a 50 kg bag using AutoCAD or Solidworks. Processes for the machine: - Worker places bag stack - Robot arm opens bag - Valve opens to fill bag - Robot arm sews bag - Robot arm scans bag for metal dust - Bag is then moved to a lorry by…
Lab Experiment SCOPE: The object or intent of the particular lab/experiment is to be stated. The main theme for each lab/experiment is to be stated. The following should be observed and stated: 1. PROCEDURE: Outline the steps that were followed to conduct this lab/experiment. Limit this to…
A siphon is used to draw water from a tank. The arrangement is shown in Fig. E. 6.19. Calculate the flow rate and pressure at point 2. The frictional loss equals 40 V2/2g. Atmospheric pressure is 10.2 m of water.
E 6.15. A jet directed at 30° reaches a maximum height of 3 m at a horizontal distance of 18 m. Determine the issuing velocity of the jet. (16.9 m/s)
The Cathedral and the Bazaar is a collection of essays originally meant for programmers and technical managers, written by Eric S. Raymond on software engineering methods. a) State FIVE (5) differences between cathedral and bazaar. [10 Marks] b) Microsoft is still at the forefront for many…
Calculate the height to which the jet, issuing at 18.8 m/s will rise when (i) The jet is directed vertically (ii) when it is directed at 45°. Also find the horizontal distance travelled in this case.
The diameter of a water jet at the nozzle exit is 75 mm. If the diameter at a height of 12 m is 98.7 mm when the jet is directed vertically, determine the height to which the jet will rise.
A tissue-engineered heart valve is mechanically loaded in a physiological salt solution (pressure = 0 MPa). The response of the fibroblasts depends on the mechanical load that the tissue senses. For this reason, knowledge of the exact stress history is vital. A strain of 4% is imposed in…
Sketch within a cubic unit cell the (123) and (130) planes.
Within a cubic unit cell, sketch the [103] and [122] directions.
A shaft with a diameter of 100 mm will be manufactured. The standard deviation of the shafts produced with the quality control was calculated as ± 0.1 mm. This shaft will rotate inside a bearing hole slightly larger than 100 mm in diameter. Accordingly, what should be the minimum hole diameter…
Write the result of the expression y = 10.2 / 2 with the uncertainty.
The long side of a rectangular area is measured at 100 m ± 10% and the short at 4 m ± 1%. What is the uncertainty of the area with a nominal value of 400 m2?
A horizontal pipe carrying water is gradually tapering. At one section the diameter is 150 mm and flow velocity is 1.5 m/s. (i) If the drop in pressure is 1.104 bar at a reduced section determine the diameter at the section. (ii) If the drop in pressure is 5 kN/m2, what will be the diameter?…
describe the structural properties with reference to material properties of metal, using non metal carbon
describe the structural properties with reference to material properties of metal using copper.
It is important for a materials engineer to have the ability to select the right material when designing a product. If you can identify the right material to use and justify why you chose that material for the product, then you have shown that you really understand this subject well. A car is…
Can you send me the bearing catalog values and also the C10 catalog values directly?
Please write a one-page paper on the following question: Many suggest that a scarce item in the future will be water. If you could think of an inexpensive way to get water from places of abundance to places where it is needed for drinking, farming, and other uses, such as fracking, you could…
A Francis turbine has a net head of 60 m at the inlet and operates at 420 RPM. The outer diameter of the turbine is 0.9 m and the inner diameter is 0.45 m. It is known that the flow rate at the turbine inlet and outlet is constant. Since the hydraulic efficiency of the turbine is 80%, the…
A centrifugal pump pumps water between two tanks open to the atmosphere. There is a height difference of 90 m between the upper tank and the lower tank, and there is a total loss of load (friction + local) of 15 m in the system. The blade width at the pump inlet and outlet is the same and is…
Given specific magnitudes of P 1 =390 N 1 P 2 =298 N 1 L 1 =3 m, L 2 =2 m, L 3 =2 m determine the vertical reaction at the left hand beam support. Give your answer, with the correct sign, rounded to the nearest whole Newton. Include the units for your answer.
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