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Physics 101 Mechanics Q&A Archive of November 4, 2021

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November 4 of 2021

What is the angle between A = ?3?+ 4j+ 2k and B = 2i? 3j+ 5k ?
help
\( r=10 \) \( q_{1}=q_{2} \) \( F=10 \) \( q_{1}=? \) \( q_{2}=? \)
A snowboarder on a 30O slope is travelling at a constant speed of 40km/hr. The weight of the snowboarder is 80kg and carrying a 20kg bag. The slope suddenly steeps to 40O, the bag strap brakes and falls off. What is the average Power that needs to be dissipated by the snowboarder to stopā€¦
Question steel pipe of length 3.5m outside diameter 0.8m and inside diameter 0.6m. The inside of the pipe is neatly fitted with a copper rod. The unit is compressed by an axial force = 100 KN; The modulus of elasticity steel = 300 GPa, copper = 117 GPa; Determine the following quantities forā€¦
Question steel pipe of length 3.5m outside diameter 0.8m and inside diameter 0.6m. The inside of the pipe neatly fitted copper rod. The unit is compressed by an axial force = 100 KN; The modulus of elasticity steel = 300 GPa copper 117GPa; Determine the following quantities for the pipe: Theā€¦
elastic collision of an object with a wall
A point source of light has an intensity of 410cd and radiates uniformly in all directions. Calculate: I) The quantity of flux following into the hemisphere Ii) The average illuminance produced on the inside surface of this hemisphere if it has a radius of 1.5m.
When a figure skater is initially rotating with arms outstretched and she then brings her arms closer to her body, it is observed that her angular velocity increases. Ignore any effects due to friction and air resistance. Her angular velocity increases because...
A company has 300 workers. 40% of the workers are doing data entry. Experts assessed that those doing data entry are at risk of getting wrist pain and that none of the other workers is at risk of getting wrist pain_ An assessment tool was also used to predict who is at risk of getting wristā€¦
A 15.0-kg fish swimming at 1.10 m/s suddenly gobbles up a 4.50-kg fish that is initially stationary. Ignore any drag effects of the water. (a) Find the speed of the large fish just after it eats the small one. (b) How much mechanical energy was dissipated during this meal?
A woman wearing contact lenses with an optical power of +2.5 D has her near point at 25 cm. What is her near point distance when she is not wearing contact lenses?
A near-sighted person has a far point of 1.5 m. What is the power of the contact lens needed in order for this person to see objects at infinity?
A 50 gram cube of ice, initially at 0.0?C, is dropped into 200 gram of water in an 80 gram aluminium container, both initially at 30?C. What is the final equilibrium temperature? (Specific heat for aluminium is 900 J/kg?C.)
The diffusion coefficient of water in water is 2.0 Ɨ 10ā€“9 m2/s. How long will it take for a large number of water molecules to travel a root mean square distance of 1.0 mm from their initial position in the centre of a bucket of water?
9.0 grams of water in a 2.0 L pressure vessel is heated to 500?C. What is the pressure inside the container? (one mole of water has a mass of 18 grams)
The average density of the material in intergalactic space is approximately 2.5 Ɨ 10ā€“27 kg/m3. What is the volume of a lead sample, ? lead = 11 300 kg/m3, that has the same mass as 8.0 Ɨ 1024 m3 of intergalactic space?
The coefficient of linear expansion of steel is 12 Ɨ 10ā€“6/CĀ°. A railroad track is made of individual rails of steel 1.0 km in length. By what length would these rails change between a cold day when the temperature is ā€“10 Ā°C and a hot day at 30 Ā°C?
Two moles of an ideal gas at 3.0 atm and 10Ā°C are heated up to 150 Ā°C. If the volume is held constant during this heating, what is the final pressure?
Two waves are described by: y1 = 6 cos 180t and y2 = 6 cos 186t, (both in metres). With what angular frequency does the maximum amplitude of the resultant wave vary with time?
Bats can detect small objects such as insects that are of a size of the order of a wavelength. If bats emit a chirp at a frequency of 60 kHz and the speed of sound waves in air is 330 m/s, what is the smallest size insect they can detect?
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in radians) of the motion at t = 2 s is:
A clown is standing upright and his eyes are 2 m above the floor. The clown looks at himself in a full-length mirror (floor to ceiling). Where in the mirror must he look to see his feet?
A crate that weighs 25 N is held at rest on a frictionless incline by a force that is parallel to the incline. If the incline is 25? above the horizontal, the magnitude of the normal force of the incline on the crate is
A 2500 kg truck moving at 10.00 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 7.00 m/s. What was the mass of the struck car?
A 1000 kg sports car accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered by the car engine?
An ice hockey puck moving at 7.0 m/s coasts to a halt in 75 m on a smooth, flat ice surface. What is the coefficient of friction between the ice and the puck?
An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 5.0 milliseconds. What is the magnitude of this acceleration?
A 12 volt battery delivers a current of 2 A for five minutes to a circuit. How much charge does the battery supply in this time to the circuit?
For the human tibia bone, the ultimate tensile strength (the point at which fracture occurs) is 1.4 Ɨ 108 N mā€“2. What is the strain at the point of fracture? Assume that Hookeā€™s Law is valid up to the point of fracture. (The modulus of elasticity for bone in tension is 18 Ɨ 109 Pa)
an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 98 N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the force M in the drawing, at a pointā€¦
. A metal bar is used to conduct heat. When the temperature at one end is 100Ā°C and at the other is 20Ā°C, heat is transferred at a rate of 16 J/s. If the temperature of the hotter end is reduced to 80Ā°C, what will be the rate of heat transfer?
The coefficient of linear expansion of steel is 1.1 Ɨ 10ā€“5 per Ā° C. A steel ball has a volume of exactly 100 cm3 at 0Ā°C. When heated to 100Ā°C, its volume becomes:
A bag of potato chips contains 2.00 L of air when it is sealed at sea level at a pressure of 1.00 atm (101.3 kPa) and a temperature of 20.0Ā°C. What will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00Ā°C and atmosphericā€¦
What is the magnification of an object placed 6.30 mm from a symmetric, converging, thin lens made of crown-glass that has a 6.00 mm focal length. The object is illuminated by 550 nm light in air.
A sodium surface is illuminated with light having a wavelength of 300 nm. Electrons are ejected from the surface through the photoelectric effect with 1.67 eV of kinetic energy. What is the energy of each photon?
A 0.500 kg mass suspended from a spring oscillates with a simple harmonic motion with a period of 2.00 s. How much mass must be added to change the period to 2.50 s?
A ball is thrown from ground level at an initial velocity of 29.4 m/s at an initial angle of 30Ā° above the horizontal ground. What is the maximum height that the ball reaches in its trajectory?
A car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450 s with an average acceleration of 60.0 m/s2 in the direction opposite that of the car's velocity. What was the speed, in km/h, of the car before the collision?
A woman stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 10 m/s. The instant before the stone hits the ground below, it has 450 J of kinetic energy. If she were to throw the stone horizontally outward from the cliff with the same initial speed ofā€¦
A 975 kg car accelerates with constant acceleration from rest to 26.7 m/s in a distance of 120 m. What is the magnitude of the net force acting on the car?
A 0.050 kg lump of clay moving horizontally at 12 m/s strikes and sticks to a stationary 0.15 kg cart that can move on a frictionless track. Determine the speed of the cart and clay after the collision.
A train travels due south at 60 m/s. It reverses its direction and travels due north at 60 m/s. What is the change in velocity of the train?
How tall must a water-filled manometer be to measure blood pressure as high as 320 mmHg? ?water = 1000 kg/m3, ?mercury = 13600 kg/m3.
In an experiment to determine the thermal conductivity of a bar of a new alloy, one end of the bar is maintained at 0.0 Ā°C and the other end at 100.0 Ā°C. The bar has a crosssectional area of 1.0 cm2 and a length of 15 cm. If the rate of heat conduction through the bar is 34 W, what is theā€¦
A black metal cube (emissivity = 1) with each face being 10 cm by 10 cm is at a temperature of 100Ā°C. The metal cube is in a vacuum chamber. The walls of the vacuum chamber are at a temperature of 0Ā°C. What is the net rate at which the cube is losing energy?
Two cubes, one silver and one iron, have the same mass and temperature. A quantity Q of heat is removed from each cube. Which one of the following properties causes the final temperatures of the cubes to be different?
The density of mercury is 1.36 Ɨ 104 kg/m3. What is the mass of a 2.16 Ɨ 10ā€“4 m3 sample of mercury?
How many moles of air must escape from a 10 m wide, 8 m long and 5 m high rectangular room when the temperature in the room is raised from 0Ā°C to 20Ā°C? Assume the pressure of air in the room remains unchanged at one atmosphere (101.3 kPa) while the room is heated.
In the Apollo 1 tragedy, a fire in the spacecraft command module during a test raised the pressure inside the command module to 200 kPa. The hatch (door) in the spacecraft was designed to open inwards. Because the pressure inside the command module was greater than atmospheric pressureā€¦
A balloon is inflated with air and tied closed near a fresh water lake somewhere in New Zealand. The balloon is then taken underwater by a scuba diver. If the volume of the balloon at the surface is 6 L, how deep approximately is the balloon when its volume is reduced to 1 L? Assume that theā€¦
Light moving through air (nair = 1.00) strikes a diamond (ndiamond = 2.42) with an angle of incidence of 60Ā°. What is the angle of refraction?
A 1500 kg lift moves upward with constant speed through a vertical distance of 25 m. How much work was done by the motor that pulled the lift up?
A diver leaps horizontally from the top of a 36.0 m high cliff. At the bottom of the cliff there is a band of rocks that extend 6.0 m out from the cliff base. Assuming free fall after the diver leaps horizontally, what must be the smallest magnitude of the diverā€™s velocity at the start ofā€¦
A skier leaves the top of a slope with an initial speed of 5.0 m/s. Her speed at the bottom of the slope is 13 m/s. What is the height of the slope? Assume friction is negligible
A river flows directly from West to East. A boat directly crosses the river from South to North as seen by an observer standing on the bank of the river. The speed of the boat relative to the water is 5 m/s. The velocity of the boat as measured by an observer standing on the bank of theā€¦
A car accelerates at 2 m/s2. Assuming the car starts from rest, how far will it travel in 10 seconds?
Two forces act on a 10 kg object. The first force has a magnitude of 100 N and is directed north. The second force is 120 N, 30Ā° south of west. What is the acceleration of the object resulting from the application of these two forces to the object?
A rollercoaster car is moving down a slope at 10 m/s at point A. Point A is 20.0 metres above the ground. It goes around a loop. At point B (the top of the loop) the car is moving at 15 m/s. What is the height of point B above the ground? Assume that frictional losses are negligible
A 50.0 kg boy runs at a velocity of 10.0 m/s to the right and jumps onto a cart as shown in the figure. The cart is initially moving to the left at 2.0 m/s. If the velocity of the cart with the boy on it is 2.5 m/s to the right, what is the mass of the cart?
An ice hockey puck is sliding across a level ice surface. The speed of the puck decreases at a rate of 0.61 m/s2. The coefficient of kinetic friction between the puck and ice is:
A car traveling along a road begins accelerating with a constant acceleration of 1.5 m/s2 in the direction of motion. After traveling 392 m at this acceleration, its speed is 35 m/s. Determine the speed of the car when it began accelerating.
Mary and Bob are riding scooters and approach each other at an intersection. Mary is traveling north at 20 m/s with respect to the ground, while Bob is traveling west at 17 m/s with respect to the ground. What is the velocity of Mary as described by Bob i.e. what is the velocity of Mary withā€¦
A 5 litre beaker made of lead is filled to the brim with liquid mercury in an oven at 200Ā°C. A PVC ball with a volume of 0.07 litre is next to the beaker in the oven. What is the highest temperature that the temperature in the oven can be reduced to, so that a robotic arm inside the oven, canā€¦
Sirius B is a white star that has a surface temperature (in Kelvin) that is four times that of our sun. Sirius B radiates only 4% the power radiated by the sun. Assuming that Sirius B has the same emissivity as the sun, find the ratio of the radius of the sun to that of Sirius B i.e. findā€¦
Scientists experiment with a balloon near a Himalayan fresh water lake at an altitude of 5000 m where atmospheric pressure is half of that at sea level. The temperature of the lake is uniform with depth and identical to the air at the surface of the lake. To what depth should a balloon be takenā€¦
Two forces act on a 20 kg object. The first force has a magnitude of 75 N and is directed 25Ā° north of east. The second force is 110 N, 45Ā° south of east. What is the acceleration of the object resulting from the application of these two forces to the object?
An object is moving along a straight line. The below graph shows the object's velocity as a function of time.
A ball is thrown from the top of a building with an initial velocity of 20 m/s in the horizontal direction. If the top of the building is 70 m above the ground, how far horizontally will the ball land from the foot of the building? Assume the ground is level and ignore air friction.
A boat is traveling upstream at 10km/h with respect to the water in a river that is flowing at 5 km/h (with respect to the ground). A man runs directly across the boat, from one side to the other, at 8km/h (with respect to the boat). The speed of the man with respect to the ground is:
A 50 kg dwarf is sitting and holding on to a 20 kg package on a frictionless, frozen lake. In order to move across the frozen lake, the dwarf kicks the 20 kg package away from himself along the ice surface. The 20 kg package moves across the frozen lake at a speed of 15 m/s. What is the recoilā€¦
A car is moving at 2 m/s. The car then accelerates at a constant rate from 2 m/s to 17 m/s in 5 seconds. What distance does the car travel while it is accelerating?
Heating air by condensing steam. Air at a pressure of 101.3 Kpa and 288.8 K
Heating air by condensing steam. Air at a pressure of 101.3 Kpa and 288.8 K
Naturally occurring Potassium-40 is listed as responsible for 16 mrem/year of background radiation Calculate the mass of Potassium-40 that must be inside the 55 kg body of a woman to produce this dose. Each Potassium-40 decay emits a 1.32-MeV beta particle (RBE-1), and 50 percent of theā€¦
Emmanuel Zacchini launched as a human cannonball in 1940 soared over three Ferris wheels each 18.0 m high covering a horizontal distance of 10.63m. a.) Assuming that the point of projection is 2.50 m above the ground and that he landed safely on a net placed at the same level, find his initialā€¦
A light string passes over a light frictionless pulley and has a 275 g load attached to one end and a 120 g load attached to the other end. If the system is allowed to fall freely, what is the magnitude of the tension?
An irregularly shaped object that is 10 m long is placed with each end on a scale. If the scale on the right reads 96 N while the scale on the left reads 71 N, how far from the left end is the center of gravity of this object?
A mechanic applies a tangential force of 250 N to the end of a torque wrench that is 22.0 cm long. What is the magnitude of the applied torque?
A bullet is fired vertically upward with an initial speed of 300 m/s. (a) How high will it go?
A stone is thrown vertically upward from a high bridge and, on its return it narrowly misses the bridge and plunges into the water below exactly 7.5 s after launch. How high is the bridge above the water if the initial upward speed of the stone is 8.0 m/s?
How do I determine the change in thermal energy, which we assume is where energy goes during collision in terms of joules
Can I get help with this one please?
A curling stone, with a mass of 20.0 kg, slides across the ice at 1.50 m/s. It collides head on with a stationary 0.160-kg hockey puck. After the collision, the puckā€™s speed is 2.50 m/s. What is the stoneā€™s final velocity?
Jack stands at rest on a skateboard. The mass of Jack and the skateboard together is 75 kg. Ryan throws a 3.0 kg ball horizontally to the right at 4.0 m/s to Jack, who catches it. What is the final speed of Jack and the skateboard?
A 10 g bullet is fired into a 1.0 kg wood block, where it lodges. Subsequently, the block slides 4.0 m across a floor (Āµk = 0.20 for wood on wood). What was the bulletā€™s speed?
A car traveling at 20 m/s crashes into a bridge abutment. Estimate the force on the driver if the driver is stopped by a. 20-m-long row of water-filled barrels b. the crumple zone of her car (~1 m). Assume a constant acceleration.
A 500 kg rocket sled is coasting at 20 m/s. It then turns on its rocket engines for 5.0 s, with a thrust of 1000 N. What is its final speed?
What is different unit of force
What is work done when force is 5N and displacement is 10metre. The angle between force and displacement is 60 degree
What is work done when force is 5N and displacement is 10metre. The angle between force and displacement is 60 degree
define molality. One mark question
Give me the definition of molality
What is the work energy principal
Convert 5km to micrometre
Emmanuel Zacchini launched as a human cannonball in 1940 soared over three Ferris wheels each 18.0 m high covering a horizontal distance of 10.63m. a.) Assuming that the point of projection is 2.50 m above the ground and that he landed safely on a net placed at the same level, find his initialā€¦
A laser emits light at a wavelength of 400 nm in the form of short pulses that last 2.5 Ɨ 10ā»Ā¹āµ s and propagate in the positive direction. the minimum frequency uncertainty of the light in the pulse;
A laser emits light at a wavelength of 400 nm in the form of short pulses that last 2.5 Ɨ 10?15 s and propagate in the positive direction. the energy and the minimum energy uncertainty of a single photon in the pulse; ā€¢ the minimum frequency uncertainty of the light in the pulse; ā€¢ the spatialā€¦
Blocks A and B with masses 2.0 kg and 10.0 kg respectively move on a frictionless, horizontal surface. Initially, block B is at rest and block A is moving toward it at 2.0 m/s. the blocks are equipped with ideal spring bumpers. The collision is head on, so all motion before and after collisionā€¦
Two astronauts, one weighing 45 kg and the other 77 kg, are initially at rest together in outer space. Then they separate. How far away are they when the lightest astronaut has moved 21 m?
A 13-kg hammer hits a nail at a velocity of 8.5 m / s and stops in a time interval of 7.0 ms. (a) What is the impulse given to the nail? (b) What is the average force acting on the nail? (ms = millisecond)
A 0.167 kg baseball thrown at 33.1 m / s is hit in a horizontal line directly towards the launcher at 43.7 m / s. If the contact time between the bat and the ball is 5.23x10 ^ 3s, find the force (assumed constant) between the ball and the bat.
A constant frictional force of 31 N acts on an 87 kg skier for 23 s on level snow. What is the change in speed of the skier?
A 15.0 kg fish swimming at 1.10 m/s suddenly gobbles up a 4.50 kg fish that is initially stationary. Neglect any drag effects of the water.(a) Find the speed of the large fish just after it eats the small one.(b) How much mechanical energy was dissipated during this meal?
What is the magnitude of the momentum of a 9.2 kg eagle flying with a speed of 89.4 m / s?
A 68.5 kg astronaut is doing a repair in space on the orbiting space station. She throws a 2.25 kg tool away from her at 3.20 m/s relative to the space station. With what speed and in what direction will she begin to move?
Three forces, A, B, and C, are acting on the same object with magnitudes a, b, and c, respectively. Force A acts to the right, force B acts to the left, and force C acts downward. What is a necessary condition for the object to move straight down?
A 0.0450 kg golf ball initially at rest is given a speed of 25.0 m/s when a club strikes. If the club and ball are in contact for 2.00 ms, what average force acts on the ball? Is the effect of the ballā€™s weight during the time of contact significant? Why or why not?
A tight rope walker traverses a wire with the aid of a balancing pole. The moment of inertia of the person about their COG (Iperson) is 15 kg m2. The moment of inertia of the pole about its COG (Ipole) is 250 kg m2. As the person falls to one side, the pole imparts a CW restoring torque of ?40ā€¦
What is the angle between A = ?3?+ 4j+ 2k and B = 2i? 3j+ 5k ?
help
\( r=10 \) \( q_{1}=q_{2} \) \( F=10 \) \( q_{1}=? \) \( q_{2}=? \)
A snowboarder on a 30O slope is travelling at a constant speed of 40km/hr. The weight of the snowboarder is 80kg and carrying a 20kg bag. The slope suddenly steeps to 40O, the bag strap brakes and falls off. What is the average Power that needs to be dissipated by the snowboarder to stopā€¦
Question steel pipe of length 3.5m outside diameter 0.8m and inside diameter 0.6m. The inside of the pipe is neatly fitted with a copper rod. The unit is compressed by an axial force = 100 KN; The modulus of elasticity steel = 300 GPa, copper = 117 GPa; Determine the following quantities forā€¦
Question steel pipe of length 3.5m outside diameter 0.8m and inside diameter 0.6m. The inside of the pipe neatly fitted copper rod. The unit is compressed by an axial force = 100 KN; The modulus of elasticity steel = 300 GPa copper 117GPa; Determine the following quantities for the pipe: Theā€¦
elastic collision of an object with a wall
A point source of light has an intensity of 410cd and radiates uniformly in all directions. Calculate: I) The quantity of flux following into the hemisphere Ii) The average illuminance produced on the inside surface of this hemisphere if it has a radius of 1.5m.
A company has 300 workers. 40% of the workers are doing data entry. Experts assessed that those doing data entry are at risk of getting wrist pain and that none of the other workers is at risk of getting wrist pain_ An assessment tool was also used to predict who is at risk of getting wristā€¦
A woman wearing contact lenses with an optical power of +2.5 D has her near point at 25 cm. What is her near point distance when she is not wearing contact lenses?
A near-sighted person has a far point of 1.5 m. What is the power of the contact lens needed in order for this person to see objects at infinity?
A 50 gram cube of ice, initially at 0.0?C, is dropped into 200 gram of water in an 80 gram aluminium container, both initially at 30?C. What is the final equilibrium temperature? (Specific heat for aluminium is 900 J/kg?C.)
The diffusion coefficient of water in water is 2.0 Ɨ 10ā€“9 m2/s. How long will it take for a large number of water molecules to travel a root mean square distance of 1.0 mm from their initial position in the centre of a bucket of water?
9.0 grams of water in a 2.0 L pressure vessel is heated to 500?C. What is the pressure inside the container? (one mole of water has a mass of 18 grams)
The average density of the material in intergalactic space is approximately 2.5 Ɨ 10ā€“27 kg/m3. What is the volume of a lead sample, ? lead = 11 300 kg/m3, that has the same mass as 8.0 Ɨ 1024 m3 of intergalactic space?
The coefficient of linear expansion of steel is 12 Ɨ 10ā€“6/CĀ°. A railroad track is made of individual rails of steel 1.0 km in length. By what length would these rails change between a cold day when the temperature is ā€“10 Ā°C and a hot day at 30 Ā°C?
Two moles of an ideal gas at 3.0 atm and 10Ā°C are heated up to 150 Ā°C. If the volume is held constant during this heating, what is the final pressure?
Two waves are described by: y1 = 6 cos 180t and y2 = 6 cos 186t, (both in metres). With what angular frequency does the maximum amplitude of the resultant wave vary with time?
Bats can detect small objects such as insects that are of a size of the order of a wavelength. If bats emit a chirp at a frequency of 60 kHz and the speed of sound waves in air is 330 m/s, what is the smallest size insect they can detect?
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in radians) of the motion at t = 2 s is:
A clown is standing upright and his eyes are 2 m above the floor. The clown looks at himself in a full-length mirror (floor to ceiling). Where in the mirror must he look to see his feet?
A crate that weighs 25 N is held at rest on a frictionless incline by a force that is parallel to the incline. If the incline is 25? above the horizontal, the magnitude of the normal force of the incline on the crate is
A 2500 kg truck moving at 10.00 m/s strikes a car waiting at a traffic light, hooking bumpers. The two continue to move together at 7.00 m/s. What was the mass of the struck car?
A 1000 kg sports car accelerates from zero to 25 m/s in 7.5 s. What is the average power delivered by the car engine?
An ice hockey puck moving at 7.0 m/s coasts to a halt in 75 m on a smooth, flat ice surface. What is the coefficient of friction between the ice and the puck?
An electron, starting from rest and moving with a constant acceleration, travels 2.0 cm in 5.0 milliseconds. What is the magnitude of this acceleration?
A 12 volt battery delivers a current of 2 A for five minutes to a circuit. How much charge does the battery supply in this time to the circuit?
For the human tibia bone, the ultimate tensile strength (the point at which fracture occurs) is 1.4 Ɨ 108 N mā€“2. What is the strain at the point of fracture? Assume that Hookeā€™s Law is valid up to the point of fracture. (The modulus of elasticity for bone in tension is 18 Ɨ 109 Pa)
an outstretched arm (0.61 m in length) that is parallel to the floor. The arm is pulling downward against the ring attached to the pulley system, in order to hold the 98 N weight stationary. To pull the arm downward, the latissimus dorsi muscle applies the force M in the drawing, at a pointā€¦
. A metal bar is used to conduct heat. When the temperature at one end is 100Ā°C and at the other is 20Ā°C, heat is transferred at a rate of 16 J/s. If the temperature of the hotter end is reduced to 80Ā°C, what will be the rate of heat transfer?
The coefficient of linear expansion of steel is 1.1 Ɨ 10ā€“5 per Ā° C. A steel ball has a volume of exactly 100 cm3 at 0Ā°C. When heated to 100Ā°C, its volume becomes:
A bag of potato chips contains 2.00 L of air when it is sealed at sea level at a pressure of 1.00 atm (101.3 kPa) and a temperature of 20.0Ā°C. What will be the volume of the air in the bag if you take it with you, still sealed, to the mountains where the temperature is 7.00Ā°C and atmosphericā€¦
What is the magnification of an object placed 6.30 mm from a symmetric, converging, thin lens made of crown-glass that has a 6.00 mm focal length. The object is illuminated by 550 nm light in air.
A 0.500 kg mass suspended from a spring oscillates with a simple harmonic motion with a period of 2.00 s. How much mass must be added to change the period to 2.50 s?
A ball is thrown from ground level at an initial velocity of 29.4 m/s at an initial angle of 30Ā° above the horizontal ground. What is the maximum height that the ball reaches in its trajectory?
A car is moving at a constant velocity when it is involved in a collision. The car comes to rest after 0.450 s with an average acceleration of 60.0 m/s2 in the direction opposite that of the car's velocity. What was the speed, in km/h, of the car before the collision?
A woman stands on the edge of a cliff and throws a stone vertically downward with an initial speed of 10 m/s. The instant before the stone hits the ground below, it has 450 J of kinetic energy. If she were to throw the stone horizontally outward from the cliff with the same initial speed ofā€¦
A 975 kg car accelerates with constant acceleration from rest to 26.7 m/s in a distance of 120 m. What is the magnitude of the net force acting on the car?
A 0.050 kg lump of clay moving horizontally at 12 m/s strikes and sticks to a stationary 0.15 kg cart that can move on a frictionless track. Determine the speed of the cart and clay after the collision.
A train travels due south at 60 m/s. It reverses its direction and travels due north at 60 m/s. What is the change in velocity of the train?
How tall must a water-filled manometer be to measure blood pressure as high as 320 mmHg? ?water = 1000 kg/m3, ?mercury = 13600 kg/m3.
In an experiment to determine the thermal conductivity of a bar of a new alloy, one end of the bar is maintained at 0.0 Ā°C and the other end at 100.0 Ā°C. The bar has a crosssectional area of 1.0 cm2 and a length of 15 cm. If the rate of heat conduction through the bar is 34 W, what is theā€¦
Two cubes, one silver and one iron, have the same mass and temperature. A quantity Q of heat is removed from each cube. Which one of the following properties causes the final temperatures of the cubes to be different?
The density of mercury is 1.36 Ɨ 104 kg/m3. What is the mass of a 2.16 Ɨ 10ā€“4 m3 sample of mercury?
How many moles of air must escape from a 10 m wide, 8 m long and 5 m high rectangular room when the temperature in the room is raised from 0Ā°C to 20Ā°C? Assume the pressure of air in the room remains unchanged at one atmosphere (101.3 kPa) while the room is heated.
In the Apollo 1 tragedy, a fire in the spacecraft command module during a test raised the pressure inside the command module to 200 kPa. The hatch (door) in the spacecraft was designed to open inwards. Because the pressure inside the command module was greater than atmospheric pressureā€¦
A balloon is inflated with air and tied closed near a fresh water lake somewhere in New Zealand. The balloon is then taken underwater by a scuba diver. If the volume of the balloon at the surface is 6 L, how deep approximately is the balloon when its volume is reduced to 1 L? Assume that theā€¦
Light moving through air (nair = 1.00) strikes a diamond (ndiamond = 2.42) with an angle of incidence of 60Ā°. What is the angle of refraction?
A 1500 kg lift moves upward with constant speed through a vertical distance of 25 m. How much work was done by the motor that pulled the lift up?
A diver leaps horizontally from the top of a 36.0 m high cliff. At the bottom of the cliff there is a band of rocks that extend 6.0 m out from the cliff base. Assuming free fall after the diver leaps horizontally, what must be the smallest magnitude of the diverā€™s velocity at the start ofā€¦
A skier leaves the top of a slope with an initial speed of 5.0 m/s. Her speed at the bottom of the slope is 13 m/s. What is the height of the slope? Assume friction is negligible
A river flows directly from West to East. A boat directly crosses the river from South to North as seen by an observer standing on the bank of the river. The speed of the boat relative to the water is 5 m/s. The velocity of the boat as measured by an observer standing on the bank of theā€¦
A car accelerates at 2 m/s2. Assuming the car starts from rest, how far will it travel in 10 seconds?
Two forces act on a 10 kg object. The first force has a magnitude of 100 N and is directed north. The second force is 120 N, 30Ā° south of west. What is the acceleration of the object resulting from the application of these two forces to the object?
A rollercoaster car is moving down a slope at 10 m/s at point A. Point A is 20.0 metres above the ground. It goes around a loop. At point B (the top of the loop) the car is moving at 15 m/s. What is the height of point B above the ground? Assume that frictional losses are negligible
A 50.0 kg boy runs at a velocity of 10.0 m/s to the right and jumps onto a cart as shown in the figure. The cart is initially moving to the left at 2.0 m/s. If the velocity of the cart with the boy on it is 2.5 m/s to the right, what is the mass of the cart?
An ice hockey puck is sliding across a level ice surface. The speed of the puck decreases at a rate of 0.61 m/s2. The coefficient of kinetic friction between the puck and ice is:
A car traveling along a road begins accelerating with a constant acceleration of 1.5 m/s2 in the direction of motion. After traveling 392 m at this acceleration, its speed is 35 m/s. Determine the speed of the car when it began accelerating.
Mary and Bob are riding scooters and approach each other at an intersection. Mary is traveling north at 20 m/s with respect to the ground, while Bob is traveling west at 17 m/s with respect to the ground. What is the velocity of Mary as described by Bob i.e. what is the velocity of Mary withā€¦
A 5 litre beaker made of lead is filled to the brim with liquid mercury in an oven at 200Ā°C. A PVC ball with a volume of 0.07 litre is next to the beaker in the oven. What is the highest temperature that the temperature in the oven can be reduced to, so that a robotic arm inside the oven, canā€¦
Sirius B is a white star that has a surface temperature (in Kelvin) that is four times that of our sun. Sirius B radiates only 4% the power radiated by the sun. Assuming that Sirius B has the same emissivity as the sun, find the ratio of the radius of the sun to that of Sirius B i.e. findā€¦
Scientists experiment with a balloon near a Himalayan fresh water lake at an altitude of 5000 m where atmospheric pressure is half of that at sea level. The temperature of the lake is uniform with depth and identical to the air at the surface of the lake. To what depth should a balloon be takenā€¦
Two forces act on a 20 kg object. The first force has a magnitude of 75 N and is directed 25Ā° north of east. The second force is 110 N, 45Ā° south of east. What is the acceleration of the object resulting from the application of these two forces to the object?
An object is moving along a straight line. The below graph shows the object's velocity as a function of time.
A ball is thrown from the top of a building with an initial velocity of 20 m/s in the horizontal direction. If the top of the building is 70 m above the ground, how far horizontally will the ball land from the foot of the building? Assume the ground is level and ignore air friction.
A boat is traveling upstream at 10km/h with respect to the water in a river that is flowing at 5 km/h (with respect to the ground). A man runs directly across the boat, from one side to the other, at 8km/h (with respect to the boat). The speed of the man with respect to the ground is:
A 50 kg dwarf is sitting and holding on to a 20 kg package on a frictionless, frozen lake. In order to move across the frozen lake, the dwarf kicks the 20 kg package away from himself along the ice surface. The 20 kg package moves across the frozen lake at a speed of 15 m/s. What is the recoilā€¦
A car is moving at 2 m/s. The car then accelerates at a constant rate from 2 m/s to 17 m/s in 5 seconds. What distance does the car travel while it is accelerating?
Heating air by condensing steam. Air at a pressure of 101.3 Kpa and 288.8 K
Heating air by condensing steam. Air at a pressure of 101.3 Kpa and 288.8 K
Emmanuel Zacchini launched as a human cannonball in 1940 soared over three Ferris wheels each 18.0 m high covering a horizontal distance of 10.63m. a.) Assuming that the point of projection is 2.50 m above the ground and that he landed safely on a net placed at the same level, find his initialā€¦
A light string passes over a light frictionless pulley and has a 275 g load attached to one end and a 120 g load attached to the other end. If the system is allowed to fall freely, what is the magnitude of the tension?
An irregularly shaped object that is 10 m long is placed with each end on a scale. If the scale on the right reads 96 N while the scale on the left reads 71 N, how far from the left end is the center of gravity of this object?
A mechanic applies a tangential force of 250 N to the end of a torque wrench that is 22.0 cm long. What is the magnitude of the applied torque?
A bullet is fired vertically upward with an initial speed of 300 m/s. (a) How high will it go?
A stone is thrown vertically upward from a high bridge and, on its return it narrowly misses the bridge and plunges into the water below exactly 7.5 s after launch. How high is the bridge above the water if the initial upward speed of the stone is 8.0 m/s?
How do I determine the change in thermal energy, which we assume is where energy goes during collision in terms of joules
Can I get help with this one please?
A curling stone, with a mass of 20.0 kg, slides across the ice at 1.50 m/s. It collides head on with a stationary 0.160-kg hockey puck. After the collision, the puckā€™s speed is 2.50 m/s. What is the stoneā€™s final velocity?
Jack stands at rest on a skateboard. The mass of Jack and the skateboard together is 75 kg. Ryan throws a 3.0 kg ball horizontally to the right at 4.0 m/s to Jack, who catches it. What is the final speed of Jack and the skateboard?
A 10 g bullet is fired into a 1.0 kg wood block, where it lodges. Subsequently, the block slides 4.0 m across a floor (Āµk = 0.20 for wood on wood). What was the bulletā€™s speed?
A car traveling at 20 m/s crashes into a bridge abutment. Estimate the force on the driver if the driver is stopped by a. 20-m-long row of water-filled barrels b. the crumple zone of her car (~1 m). Assume a constant acceleration.
A 500 kg rocket sled is coasting at 20 m/s. It then turns on its rocket engines for 5.0 s, with a thrust of 1000 N. What is its final speed?
What is different unit of force
What is work done when force is 5N and displacement is 10metre. The angle between force and displacement is 60 degree
What is work done when force is 5N and displacement is 10metre. The angle between force and displacement is 60 degree
define molality. One mark question
Give me the definition of molality
What is the work energy principal
Convert 5km to micrometre
A laser emits light at a wavelength of 400 nm in the form of short pulses that last 2.5 Ɨ 10ā»Ā¹āµ s and propagate in the positive direction. the minimum frequency uncertainty of the light in the pulse;
A laser emits light at a wavelength of 400 nm in the form of short pulses that last 2.5 Ɨ 10?15 s and propagate in the positive direction. the energy and the minimum energy uncertainty of a single photon in the pulse; ā€¢ the minimum frequency uncertainty of the light in the pulse; ā€¢ the spatialā€¦
Two astronauts, one weighing 45 kg and the other 77 kg, are initially at rest together in outer space. Then they separate. How far away are they when the lightest astronaut has moved 21 m?
A 13-kg hammer hits a nail at a velocity of 8.5 m / s and stops in a time interval of 7.0 ms. (a) What is the impulse given to the nail? (b) What is the average force acting on the nail? (ms = millisecond)
A 0.167 kg baseball thrown at 33.1 m / s is hit in a horizontal line directly towards the launcher at 43.7 m / s. If the contact time between the bat and the ball is 5.23x10 ^ 3s, find the force (assumed constant) between the ball and the bat.
A constant frictional force of 31 N acts on an 87 kg skier for 23 s on level snow. What is the change in speed of the skier?
What is the magnitude of the momentum of a 9.2 kg eagle flying with a speed of 89.4 m / s?
A tight rope walker traverses a wire with the aid of a balancing pole. The moment of inertia of the person about their COG (Iperson) is 15 kg m2. The moment of inertia of the pole about its COG (Ipole) is 250 kg m2. As the person falls to one side, the pole imparts a CW restoring torque of ?40ā€¦