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November 2021
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Physics 101 Mechanics
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November 14, 2021
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November 14 of 2021
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What is the value of m to maintain equilibrium? From Beer & Johnston, 4th edition, Chapter 10 Virtual Work.
The Messier Catalog is
A person of mass 65 kg gets in an elvator on the 10th floor of a building which is 100 meters above street level. The person rides the elevator down to the 4th floor, which is 40 meters above street level. What is the person's change in potential energy, in Joules?
The visible electromagnetic spectrum ranges from about 390 nm (violet) to 760 nm (red). This corresponds to photons with energies from (h = 6.6 × 10^-34 J·s, c = 3 × 10^8 m/s, e = 1.6 × 10^-19 C)..... (a) 1.4 eV to 2.7 eV; (b) 1.6 eV to 3.2 eV; (c) 1.8 eV to 3.5 eV; (d) 1.4 keV to 2.7…
A hockey puck is hit on a frozen lake and starts moving with a speed of 12.0 m/s. Five seconds later, its speed is 6.0 m/s. (a) What is its average acceleration? (b) What is the average value of the coefficient of kinetic friction between the puck and ice? (c) How far does the puck travel…
An object with mass m1=5.00 kg rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2=10kg, as shown in Figure P4.30. Find the acceleration of each object and the tension in the cable.
Figure P4.19
A 1000N crate is being pushed across a level floor at a constant speed by a force F of 300 N at an angle of 20 degrees below the horizontal, as shown in Figure P4.37a (1) What is the coefficient of kinetic Friction between the crate and the floor? (b) If the 300N force is instead pulling the…
The wavelength at the peak of the emitted spectrum of a star is 580 nm. The temperature at the star surface is (b = 2.9 × 10^?3 m·K): (a) 3000 K; (b) 4000 K; (c) 5000 K; (d) 6000 K; (e) 7000 K; (f) 8000 K
In Figure P4.30, M1=10kg and m2=4.0kg. The coefficient of static friction between m1 and the horizontal surface is 0.50, and the coefficient of kinetic friction of 0.30. (a) If the system is released from rest, what will its acceleration be? (b) If the system is set in motion with m2 moving…
A dockworker loading crates in a ship finds that a 20 kg crate, initially at rest on a horizontal surface, requires a 75 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60N is required to keep it moving with a constant speed. Find the…
A particle moves in the XY plane, starting from the origin at t=0 with an initial velocity having an x component of 20m/s and a y component of -15m/s
The work required to lift a crate is 270 Joules. If the crate is lifted in 15 seconds, what power (in Watts) is developed?
A child’s mobile consists of independently moving thin rods of metal attached to weights which can freely rotate about a spindle’s axis. A metal rod of mass 47 g and a length of 32 cm is attached to a weight of 122 g on one end and 340 g on the other end. How far from the 122 g mass should the…
Figure P4.34
Two packing crates of masses 10.0kg and 5.00 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 5.00 kg crates lies on smooth incline of angle 40.0 degrees. Find the acceleration of the 5.00 kg crate and tension and the tension in the string.
A 5.0 Kg bucket of water raised from a well by a rope. If the upward acceleration of the bucket is 3.0 m/s^2, find the force exerted by the rope on the bucket.
The force exerted by the wind on the sails of a sailboat is 390N north. The water exerts a force of 180N east. If the boat (including its crew) has a mass of 270 kg, what is the magnitude and direction of its acceleration? Show all math and include a free body diagram.
Two people are pulling a boat through the water as in Figure P4.20. Each exerts a force of 600 N directed at a 30.0 angle relative to the forward motion of the boat. If the boat moves with Constant velocity, find the resistive Fr exerted by the water on the boat.
The leg and cast in figure P4.18 weigh 220 N (w1). Determine the weight w2 and the angle theta need so that no force is exerted on the hip joint by the leg plus the cast. Show all math and include a free body diagram.
How much work is done lifting a 4-Newton object a vertical distance of 3 meters?
How much work is required for a mechanical hoist to lift a 7,000 Newton automobile to a height of 1.60 meters?
A gardener pushes a mower a distance of 600 meters while mowing a yard. The handle of the mower makes an angle of 42 degrees with the ground. The gardener exerts a force of 30 Newtons along the handle of the mower. How much work, in Joules, does the gardener do in mowing the lawn?
A 150N bird feeder is supported by three cables as shown in Figure P4.17. Find the tension in each cable.
Figure P4.16
please the answer of these two questions ????????????????????????????????????????????????????????????????????????????????????
Find the tension in each cable supporting the 600N cat burglar in Figure P4.15.
while riding on the bicycle if we stop paddling, why does the bicycle begin to slow down ?
The force exerted by the wind on the sails of a sailboat is 390N north. The water exerts a force of 180N east. If the boat (including its crew) has a mass of 270 kg, what is the magnitude and direction of its acceleration? Show all math and include a free body diagram.
Which would require a greater force — accelerating a 1kg mass at 10 m s or a 2 kg mass at 4 m s ?
After falling from rest from a height of 30m, the 0.50kg ball rebounds upward, reaching a height of 20m. If the contact between ball and ground lasted 2.0 milliseconds, what average force was exerted on the ball? Show all math and include a free body diagram.
A machine is capable of delivering 2000 watts of power. How high (in meters) can it lift a weight of 85 Newtons in 5 seconds?
A gas occupies a volume of 2.5 L at 9 × 105 Nm-2. Calculate the additional pressure required to decrease the volume of the gas to 1.5 L, keeping the temperature constan
The work required to lift a crate is 270 Joules. If the crate is lifted in 15 seconds, what power (in Watts) is developed?
Two forces are applied to a car in an effort to move it, as shown in Fortune P4.12 (a) What is the resultant of these two forces? (b) If the car has a mass of 3000kg, what acceleration does it have? ignore frictional force.
A crate of mass 275 kg is raised to a height of 17 meters above the floor. What potential energy, in Joules, has it acquired with respect to the floor?
Calculate the pressure of 1 × 1022 molecules of oxygen gas when enclosed in a vessel of 5-litre capacity at a temperature of 27°C
A boat moves through the water with two forces acting on it. One is a 2000-N forward push by the water on the propeller, and the other is a 1800N resistive force due to the water around the bow. (a) What is the acceleration of the 1000kg boat? (b) If it starts from rest, how far will the boat…
Cosider a solid metal sphere (S) a few centimeters in diameter and a feather (f). For each quantity in the list that follows, indicate whether the quantity is the same, greater, or lesser in the case of (S) or in that of (f)? Explain in each case why you gave the answer you did. Here is the…
A person of mass 65 kg gets in an elvator on the 10th floor of a building which is 100 meters above street level. The person rides the elevator down to the 4th floor, which is 40 meters above street level. What is the person's change in potential energy, in Joules?
Name two gases, other than carbon-dioxide, that are given out during burning of fossil fuel and contribute towards acid rain formation.
What is the difference between kilowatt and kilowatt hour?
Which one is having lesser resistance : A 60 W bulb or a 40 W bulb ?
A bullet with mass 7.0 grams travels with a speed of 380 m/s. What is its kinetic energy, in Joules?
A 5.0-g bullet leaves the muzzle of a rifle with a speed of 320m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.82 m long barrel of the rifle? Show all math and include a free body diagram.
The air exerts a forward force of 10N on the propeller of a 0.20 kg model airplane. If the plane accelerates forward at 2.0 m.s^2, what is the magnitude of the resistive force exerted by the air on the airplane? Show all math and include a free body diagram.
What happens to resistance of a conductor when temperature is increased ?
Define ohm’s law. State the law that gives the relationship between the potential difference (V) across the two ends of a conductor and the current (I) flowing through it
A freight train has a mass of 1.5 x 10^7 kg. If the locomotive can exert a constant pull of 7.5 x 10^5 N, how long does it take to increase the speed of the train from rest to 80 km/h? Show all math and include a Freebody diagram.
Define 1 ampere electric current.
Name the instrument used to measure electric current in a circuit.
A bag of sugar weighs 5.00Ib on Earth. What would it weigh in newtons Moon, where freefall acceleration is one-sixth that on Earth? Repeat for Jupiter, where g is 2.64 times that on Earth. Find the mass of the bag of sugar in kilograms at each of the three location? Include a free body diagram…
A solution of potassium chloride when mixed with silver nitrate solution, an insoluble substance is formed. Write the chemical reaction involved and mention the type of the chemical reaction.
A football punter accelerates a football from rest to a speed of 10 m/s during the time in which his toe is in contact with the ball (about 0.20s) If the football has a mass of 0.50kg, what average force does the punter exert on the ball? Explain with a free body diagram and show all math…
An object has mass 1 kg and weight 1.67 N on moon. Calculate its weight and mass on earth
A 6.0KG object undergoes an acceleration of 2.0 m/s^2. (1) What is the magnitude of the resultant force acting on it? (b) If this same force is applied to a 4.0kg object, what acceleration if produced? Explain using a free body diagram and show all work.
An object of mass 2 kg falls with an acceleration of 9.8 m s-2 towards the ground. With what acceleration will an object of mass 4 kg fall ?
The gravitational force between two objects is F. How will the force change when the distance between them is reduced to 1/4 th ?
If the net external force acting on a body is zero, then total momentum of the body is (a) Zero (b) Variable (c) Constant (d) Information not sufficient
while riding on the bicycle if we stop paddling, why does the bicycle begin to slow down ?
Two balls A and B of masses m and 2m are in motion with velocities ‘2V’ and ‘V’ respectively. Compare (i) their inertia, (ii) their momentum and (iii) the force needed to stop them in the same time
A fast moving truck loses momentum equal to 2 kg m s-1 after colliding with a stationary car. Will the car lose or gain momentum ? How much momentum is lost or gained by the car if the truck comes to the rest after collision ?
Which would require a gereater force — accelerating a 1kg mass at 10 m s or a 2 kg mass at 4 m s ?
An object is thrown vertically upward. What is its momentum at the highest point ?
You are investigating a newly discovered particle X that has an unknown mass M and moves with a constant but unknown speed u. In your experiments you observe collisions between particle X and different test particles with known masses m that are initially at rest. You let the particles collide…
Question 1
The potential energy U in Joule of a particle of mass is 4kg moving in the x-y plane is given by the formula U = 6x + 8y + 5. Here x and y are coordinates of the particle in meter. The particle is at (3,5) at t = 0 and v 0 = 0. i and jare the unit vectors across x and y axis respectively.
1-5 please
Help pleaseeeee
helppp
7. A stone is thrown horizontally at \( 15 \mathrm{~m} / \mathrm{s} \) from the top of a cliff. It takes \( 5 \mathrm{~s} \) to reach the ground. a) How far from the base of the cliff does the stone land? b) How fast is it moving just before it strikes the ground?
Help please
Help please
What is the maximum speed with which a 1500 kg car can make a turn around a curve of radius 20 m on a level (unbanked) road without sliding? (This radius turn is about what you might expect at a major intersection in a city.)
A 14-foot trailed type combined grain sowing with a spacing of 15 cm between the feet. m2 with machine 427 seeds are planted in . The purity of the seed used is 92%, germination strength 96%, thousand grain weight 45 g, seed volume weight 760 kg m-3 , which moves the machine wheel size…
An electric field is produced between two parallel plates when the voltage difference between the plates is 800V. If the plates are 0.5cm apart, what is the intensity of the electric field?
Please see photo.
What is the value of m to maintain equilibrium? From Beer & Johnston, 4th edition, Chapter 10 Virtual Work.
The Messier Catalog is
A person of mass 65 kg gets in an elvator on the 10th floor of a building which is 100 meters above street level. The person rides the elevator down to the 4th floor, which is 40 meters above street level. What is the person's change in potential energy, in Joules?
The visible electromagnetic spectrum ranges from about 390 nm (violet) to 760 nm (red). This corresponds to photons with energies from (h = 6.6 × 10^-34 J·s, c = 3 × 10^8 m/s, e = 1.6 × 10^-19 C)..... (a) 1.4 eV to 2.7 eV; (b) 1.6 eV to 3.2 eV; (c) 1.8 eV to 3.5 eV; (d) 1.4 keV to 2.7…
A hockey puck is hit on a frozen lake and starts moving with a speed of 12.0 m/s. Five seconds later, its speed is 6.0 m/s. (a) What is its average acceleration? (b) What is the average value of the coefficient of kinetic friction between the puck and ice? (c) How far does the puck travel…
An object with mass m1=5.00 kg rests on a frictionless horizontal table and is connected to a cable that passes over a pulley and is then fastened to a hanging object with mass m2=10kg, as shown in Figure P4.30. Find the acceleration of each object and the tension in the cable.
Figure P4.19
A 1000N crate is being pushed across a level floor at a constant speed by a force F of 300 N at an angle of 20 degrees below the horizontal, as shown in Figure P4.37a (1) What is the coefficient of kinetic Friction between the crate and the floor? (b) If the 300N force is instead pulling the…
The wavelength at the peak of the emitted spectrum of a star is 580 nm. The temperature at the star surface is (b = 2.9 × 10^?3 m·K): (a) 3000 K; (b) 4000 K; (c) 5000 K; (d) 6000 K; (e) 7000 K; (f) 8000 K
In Figure P4.30, M1=10kg and m2=4.0kg. The coefficient of static friction between m1 and the horizontal surface is 0.50, and the coefficient of kinetic friction of 0.30. (a) If the system is released from rest, what will its acceleration be? (b) If the system is set in motion with m2 moving…
A dockworker loading crates in a ship finds that a 20 kg crate, initially at rest on a horizontal surface, requires a 75 N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 60N is required to keep it moving with a constant speed. Find the…
A particle moves in the XY plane, starting from the origin at t=0 with an initial velocity having an x component of 20m/s and a y component of -15m/s
The work required to lift a crate is 270 Joules. If the crate is lifted in 15 seconds, what power (in Watts) is developed?
A child’s mobile consists of independently moving thin rods of metal attached to weights which can freely rotate about a spindle’s axis. A metal rod of mass 47 g and a length of 32 cm is attached to a weight of 122 g on one end and 340 g on the other end. How far from the 122 g mass should the…
Figure P4.34
A 5.0 Kg bucket of water raised from a well by a rope. If the upward acceleration of the bucket is 3.0 m/s^2, find the force exerted by the rope on the bucket.
The force exerted by the wind on the sails of a sailboat is 390N north. The water exerts a force of 180N east. If the boat (including its crew) has a mass of 270 kg, what is the magnitude and direction of its acceleration? Show all math and include a free body diagram.
Two people are pulling a boat through the water as in Figure P4.20. Each exerts a force of 600 N directed at a 30.0 angle relative to the forward motion of the boat. If the boat moves with Constant velocity, find the resistive Fr exerted by the water on the boat.
How much work is done lifting a 4-Newton object a vertical distance of 3 meters?
How much work is required for a mechanical hoist to lift a 7,000 Newton automobile to a height of 1.60 meters?
A gardener pushes a mower a distance of 600 meters while mowing a yard. The handle of the mower makes an angle of 42 degrees with the ground. The gardener exerts a force of 30 Newtons along the handle of the mower. How much work, in Joules, does the gardener do in mowing the lawn?
Figure P4.16
please the answer of these two questions ????????????????????????????????????????????????????????????????????????????????????
Find the tension in each cable supporting the 600N cat burglar in Figure P4.15.
while riding on the bicycle if we stop paddling, why does the bicycle begin to slow down ?
The force exerted by the wind on the sails of a sailboat is 390N north. The water exerts a force of 180N east. If the boat (including its crew) has a mass of 270 kg, what is the magnitude and direction of its acceleration? Show all math and include a free body diagram.
Which would require a greater force — accelerating a 1kg mass at 10 m s or a 2 kg mass at 4 m s ?
After falling from rest from a height of 30m, the 0.50kg ball rebounds upward, reaching a height of 20m. If the contact between ball and ground lasted 2.0 milliseconds, what average force was exerted on the ball? Show all math and include a free body diagram.
A machine is capable of delivering 2000 watts of power. How high (in meters) can it lift a weight of 85 Newtons in 5 seconds?
A gas occupies a volume of 2.5 L at 9 × 105 Nm-2. Calculate the additional pressure required to decrease the volume of the gas to 1.5 L, keeping the temperature constan
The work required to lift a crate is 270 Joules. If the crate is lifted in 15 seconds, what power (in Watts) is developed?
Two forces are applied to a car in an effort to move it, as shown in Fortune P4.12 (a) What is the resultant of these two forces? (b) If the car has a mass of 3000kg, what acceleration does it have? ignore frictional force.
A crate of mass 275 kg is raised to a height of 17 meters above the floor. What potential energy, in Joules, has it acquired with respect to the floor?
Calculate the pressure of 1 × 1022 molecules of oxygen gas when enclosed in a vessel of 5-litre capacity at a temperature of 27°C
A boat moves through the water with two forces acting on it. One is a 2000-N forward push by the water on the propeller, and the other is a 1800N resistive force due to the water around the bow. (a) What is the acceleration of the 1000kg boat? (b) If it starts from rest, how far will the boat…
Cosider a solid metal sphere (S) a few centimeters in diameter and a feather (f). For each quantity in the list that follows, indicate whether the quantity is the same, greater, or lesser in the case of (S) or in that of (f)? Explain in each case why you gave the answer you did. Here is the…
A person of mass 65 kg gets in an elvator on the 10th floor of a building which is 100 meters above street level. The person rides the elevator down to the 4th floor, which is 40 meters above street level. What is the person's change in potential energy, in Joules?
Name two gases, other than carbon-dioxide, that are given out during burning of fossil fuel and contribute towards acid rain formation.
What is the difference between kilowatt and kilowatt hour?
Which one is having lesser resistance : A 60 W bulb or a 40 W bulb ?
A bullet with mass 7.0 grams travels with a speed of 380 m/s. What is its kinetic energy, in Joules?
A 5.0-g bullet leaves the muzzle of a rifle with a speed of 320m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.82 m long barrel of the rifle? Show all math and include a free body diagram.
The air exerts a forward force of 10N on the propeller of a 0.20 kg model airplane. If the plane accelerates forward at 2.0 m.s^2, what is the magnitude of the resistive force exerted by the air on the airplane? Show all math and include a free body diagram.
What happens to resistance of a conductor when temperature is increased ?
Define ohm’s law. State the law that gives the relationship between the potential difference (V) across the two ends of a conductor and the current (I) flowing through it
A freight train has a mass of 1.5 x 10^7 kg. If the locomotive can exert a constant pull of 7.5 x 10^5 N, how long does it take to increase the speed of the train from rest to 80 km/h? Show all math and include a Freebody diagram.
Define 1 ampere electric current.
Name the instrument used to measure electric current in a circuit.
A bag of sugar weighs 5.00Ib on Earth. What would it weigh in newtons Moon, where freefall acceleration is one-sixth that on Earth? Repeat for Jupiter, where g is 2.64 times that on Earth. Find the mass of the bag of sugar in kilograms at each of the three location? Include a free body diagram…
A solution of potassium chloride when mixed with silver nitrate solution, an insoluble substance is formed. Write the chemical reaction involved and mention the type of the chemical reaction.
A football punter accelerates a football from rest to a speed of 10 m/s during the time in which his toe is in contact with the ball (about 0.20s) If the football has a mass of 0.50kg, what average force does the punter exert on the ball? Explain with a free body diagram and show all math…
An object has mass 1 kg and weight 1.67 N on moon. Calculate its weight and mass on earth
A 6.0KG object undergoes an acceleration of 2.0 m/s^2. (1) What is the magnitude of the resultant force acting on it? (b) If this same force is applied to a 4.0kg object, what acceleration if produced? Explain using a free body diagram and show all work.
An object of mass 2 kg falls with an acceleration of 9.8 m s-2 towards the ground. With what acceleration will an object of mass 4 kg fall ?
The gravitational force between two objects is F. How will the force change when the distance between them is reduced to 1/4 th ?
If the net external force acting on a body is zero, then total momentum of the body is (a) Zero (b) Variable (c) Constant (d) Information not sufficient
while riding on the bicycle if we stop paddling, why does the bicycle begin to slow down ?
Two balls A and B of masses m and 2m are in motion with velocities ‘2V’ and ‘V’ respectively. Compare (i) their inertia, (ii) their momentum and (iii) the force needed to stop them in the same time
A fast moving truck loses momentum equal to 2 kg m s-1 after colliding with a stationary car. Will the car lose or gain momentum ? How much momentum is lost or gained by the car if the truck comes to the rest after collision ?
Which would require a gereater force — accelerating a 1kg mass at 10 m s or a 2 kg mass at 4 m s ?
An object is thrown vertically upward. What is its momentum at the highest point ?
You are investigating a newly discovered particle X that has an unknown mass M and moves with a constant but unknown speed u. In your experiments you observe collisions between particle X and different test particles with known masses m that are initially at rest. You let the particles collide…
Question 1
1-5 please
Help pleaseeeee
helppp
7. A stone is thrown horizontally at \( 15 \mathrm{~m} / \mathrm{s} \) from the top of a cliff. It takes \( 5 \mathrm{~s} \) to reach the ground. a) How far from the base of the cliff does the stone land? b) How fast is it moving just before it strikes the ground?
Help please
What is the maximum speed with which a 1500 kg car can make a turn around a curve of radius 20 m on a level (unbanked) road without sliding? (This radius turn is about what you might expect at a major intersection in a city.)
A 14-foot trailed type combined grain sowing with a spacing of 15 cm between the feet. m2 with machine 427 seeds are planted in . The purity of the seed used is 92%, germination strength 96%, thousand grain weight 45 g, seed volume weight 760 kg m-3 , which moves the machine wheel size…
An electric field is produced between two parallel plates when the voltage difference between the plates is 800V. If the plates are 0.5cm apart, what is the intensity of the electric field?