The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) = (8.0 J/m2)x2 − (2.0 J/m4)x4. When the particle is at x = 1.0 m the magnitude of its acceleration is:

A) 0 m/s2 B) -8 m/s2 C) 8 m/s2 D) -40 m/s2 E) 40 m/s2 A) 0 m/s2 B) -8 m/s2 C) 8 m/s2 D) -40 m/s2 E) 40 m/s2

The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) =(8.0 J/m2)x2 + (2.0 J/m4)x4. When the particle is at x = 1.0 m it is traveling in the positive x direction with a speed of 5.0 m/s. It next stops momentarily to turn around at x =

A) 0 m B) -1.1 m C) 1.1 m D) -2.3 m E) 2.3 m A) 0 m B) -1.1 m C) 1.1 m D) -2.3 m E) 2.3 m

Exam 8: Potential Energy and Conservation of Energy

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A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. The total mechanical energy is 0.12 J. The greatest extension of the spring from its equilibrium length is:

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Question 41

A stationary mass m = 1.3 kg is hanging from a spring of spring constant k = 1200 N/m. You raise the mass a distance of 10 cm above its equilibrium position in a time of 1.4 s. What was the average power expended?

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Question 42

Only if a force on a particle is conservative:

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Question 43

A block of mass m is initially moving to the right on a horizontal frictionless surface at a speed v. It then compresses a spring of spring constant k. At the instant when the kinetic energy of the block is equal to the potential energy of the spring, the spring is compressed a distance of:

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Question 44

A block slides across a rough horizontal table top. The work done by friction changes:

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Question 45

Which of the five graphs correctly shows the potential energy of a spring as a function of its elongation x?

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Question 46

A rectangular block is moving along a frictionless path when it encounters the circular loop as shown. The block passes points 1,2,3,4,1 before returning to the horizontal track. At point 3:

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Question 47

The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) = (8.0 J/m²)x²− (2.0 J/m⁴)x⁴. When the particle is at x = 1.0 m the magnitude of its acceleration is:

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Question 48

A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support as shown. The object is then released. What is the tension in the cord when the object is at the lowest point of its swing?

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Question 49

A good example of kinetic energy is provided by:

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Question 50

The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) =(8.0 J/m²)x²+ (2.0 J/m⁴)x^4. When the particle is at x = 1.0 m it is traveling in the positive x direction with a speed of 5.0 m/s. It next stops momentarily to turn around at x =

(Multiple Choice)

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Question 51

A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. The total mechanical energy is 0.12 J. The greatest speed of the block is:

(Multiple Choice)

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Question 52

A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. When the spring is 4.0 cm longer than its equilibrium length, the speed of the block is 0.50 m/s. The greatest speed of the block is:

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Question 53

A 2.2-kg block starts from rest on a rough inclined plane that makes an angle of 25 $\degree$ with the horizontal. The coefficient of kinetic friction is 0.25. As the block goes 2.0 m down the plane, the mechanical energy of the Earth-block system changes by:

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Question 54

A simple pendulum consists of a 2.0 kg mass attached to a string. It is released from rest at X as shown. Its speed at the lowest point Y is:

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Question 55

A ball is held at a height H above a floor. It is then released and falls to the floor. If air resistance can be ignored, which of the five graphs below correctly gives the mechanical energy E of the Earth-ball system as a function of the altitude y of the ball?

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Question 56

The sum of the kinetic and potential energies of a system of objects is conserved:

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Question 57

A 700-N man jumps out of a window into a fire net 10 m below. The net stretches 2 m before bringing the man to rest and tossing him back into the air. The maximum potential energy of the net, compared to its unstretched potential energy, is:

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Question 58

A particle moves along the x axis under the influence of a stationary object. The net force on the particle, which is conservative, is given by F = (8N/m³)x³. If the potential energy is taken to be zero for x = 0 then the potential energy is given by:

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Question 59

A body at rest in a system is capable of doing work if:

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Question 60

Showing 41 - 60 of 63

Exam 8: Potential Energy and Conservation of Energy

A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. The total mechanical energy is 0.12 J. The greatest extension of the spring from its equilibrium length is:

A stationary mass m = 1.3 kg is hanging from a spring of spring constant k = 1200 N/m. You raise the mass a distance of 10 cm above its equilibrium position in a time of 1.4 s. What was the average power expended?

Only if a force on a particle is conservative:

A block of mass m is initially moving to the right on a horizontal frictionless surface at a speed v. It then compresses a spring of spring constant k. At the instant when the kinetic energy of the block is equal to the potential energy of the spring, the spring is compressed a distance of:

A block slides across a rough horizontal table top. The work done by friction changes:

Which of the five graphs correctly shows the potential energy of a spring as a function of its elongation x?

A rectangular block is moving along a frictionless path when it encounters the circular loop as shown. The block passes points 1,2,3,4,1 before returning to the horizontal track. At point 3:

The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) = (8.0 J/m2)x2 − (2.0 J/m4)x4. When the particle is at x = 1.0 m the magnitude of its acceleration is:

A small object of mass m, on the end of a light cord, is held horizontally at a distance r from a fixed support as shown. The object is then released. What is the tension in the cord when the object is at the lowest point of its swing?

A good example of kinetic energy is provided by:

The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) =(8.0 J/m2)x2 + (2.0 J/m4)x4. When the particle is at x = 1.0 m it is traveling in the positive x direction with a speed of 5.0 m/s. It next stops momentarily to turn around at x =

A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. The total mechanical energy is 0.12 J. The greatest speed of the block is:

A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. When the spring is 4.0 cm longer than its equilibrium length, the speed of the block is 0.50 m/s. The greatest speed of the block is:

A 2.2-kg block starts from rest on a rough inclined plane that makes an angle of 25 °\degree° with the horizontal. The coefficient of kinetic friction is 0.25. As the block goes 2.0 m down the plane, the mechanical energy of the Earth-block system changes by:

A simple pendulum consists of a 2.0 kg mass attached to a string. It is released from rest at X as shown. Its speed at the lowest point Y is:

A ball is held at a height H above a floor. It is then released and falls to the floor. If air resistance can be ignored, which of the five graphs below correctly gives the mechanical energy E of the Earth-ball system as a function of the altitude y of the ball?

The sum of the kinetic and potential energies of a system of objects is conserved:

A 700-N man jumps out of a window into a fire net 10 m below. The net stretches 2 m before bringing the man to rest and tossing him back into the air. The maximum potential energy of the net, compared to its unstretched potential energy, is:

A particle moves along the x axis under the influence of a stationary object. The net force on the particle, which is conservative, is given by F = (8N/m3)x3. If the potential energy is taken to be zero for x = 0 then the potential energy is given by:

A body at rest in a system is capable of doing work if:

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The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) = (8.0 J/m²)x²− (2.0 J/m⁴)x⁴. When the particle is at x = 1.0 m the magnitude of its acceleration is:

The potential energy of a 0.20-kg particle moving along the x axis is given by U(x) =(8.0 J/m²)x²+ (2.0 J/m⁴)x^4. When the particle is at x = 1.0 m it is traveling in the positive x direction with a speed of 5.0 m/s. It next stops momentarily to turn around at x =

A 2.2-kg block starts from rest on a rough inclined plane that makes an angle of 25 $\degree$ with the horizontal. The coefficient of kinetic friction is 0.25. As the block goes 2.0 m down the plane, the mechanical energy of the Earth-block system changes by:

A particle moves along the x axis under the influence of a stationary object. The net force on the particle, which is conservative, is given by F = (8N/m³)x³. If the potential energy is taken to be zero for x = 0 then the potential energy is given by: