A horizontal force of 200 N is applied to a 55.0-kg cart across a 15.0-m level surface.If the cart accelerates at 2.0 m/s2,then what is the work done by the force of friction as it acts to retard the motion of the cart?

A) -4.7E+3 J B) -1.4E+3 J C) -3.0E+3 J D) -9.0E+1 J E) -3.1E+2 J A) -4.7E+3 J B) -1.4E+3 J C) -3.0E+3 J D) -9.0E+1 J E) -3.1E+2 J

Exam 5: Energy | Examlex

A parachutist of mass 50.0 kg jumps out of an airplane at a height of 1 040 m.The parachute deploys,and she lands on the ground with a speed of 4.0 m /s.How much energy was lost to air friction during this jump?

(Multiple Choice)

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Question 61

A box slides across a floor and comes to rest.The work done by the frictional force on the box is

(Multiple Choice)

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Question 62

An amount of work equal to 2.0 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 26.0-g marble?

(Multiple Choice)

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Question 63

A horse pulls a 350-kg sled at constant speed along an icy road for a distance of 500 m.If the coefficient of kinetic friction between the sled and the road is 0.450,and the angle between the harness and the sled is 25°,what is the mechanical energy lost due to friction?

(Multiple Choice)

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Question 64

Three different-mass projectiles are launched from the top of a building each at different angles of elevation.Each particle has the same initial kinetic energy.Which particle has the greatest kinetic energy just as it impacts with the ground?

(Multiple Choice)

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Question 65

A pendulum consists of a mass m suspended from a string of length L.When the pendulum is swinging,how much greater is the mass's potential energy when the string is displaced from the vertical by the angle θ than when the mass is at the lowest position?

(Multiple Choice)

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Question 66

A 35.0-N crate is pulled up a 4.0-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 25.0 N between the crate and the surface,what is the force applied by the worker?

(Multiple Choice)

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Question 67

A baseball catcher puts on an exhibition by catching a 0.200-kg ball dropped from a helicopter at a height of 150 m above the catcher.If the catcher "gives" with the ball for a distance of 0.755 m while catching it,what average force is exerted on the mitt by the ball? (g = 9.80 m/s²)

(Multiple Choice)

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Question 68

In a problem using energy considerations to solve for the speed of a ball thrown from the top of a building when it strikes the ground below,where should the potential energy have its zero value?

(Multiple Choice)

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Question 69

A 26.0-N crate starting at rest slides down a rough 4.8-m-long ramp,inclined at 21.0° with the horizontal.18 J of energy is lost to friction.What will be the speed of the crate at the bottom of the incline?

(Multiple Choice)

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Question 70

A bobsled makes a run down an ice track starting at 250 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

(Multiple Choice)

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Question 71

As an object is lowered into a deep hole in the surface of the Earth,which of the following must be assumed in regard to its potential energy?

(Multiple Choice)

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Question 72

What is the minimum amount of energy required for a 60.0-kg climber carrying a 18-kg pack to climb Mt.Everest,8 250 m high?

(Multiple Choice)

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Question 73

Petra pushes a crate across a rough floor.A frictional force of 28.0 N acts to oppose the motion of the crate,and Petra pushes with a horizontal force of 36.4 N.If the net work Petra does is 94.5 J,through what distance did she push the crate?

(Multiple Choice)

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Question 74

When a Hooke's law spring is stretched a distance 3x,how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x.

(Multiple Choice)

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Question 75

Two blocks are released from the top of a building.One falls straight down while the other slides down a smooth ramp.If all friction is ignored,which one is moving faster when it reaches the bottom?

(Multiple Choice)

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Question 76

A rock is thrown straight up with an initial velocity of 15.0 m/s.Ignore energy lost to air friction.How high will the rock rise?

(Multiple Choice)

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Question 77

A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position.Under the same compression d,the spring is now used to launch a mass of 2m.How high does this second mass rise?

(Multiple Choice)

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Question 78

A horizontal force of 200 N is applied to a 55.0-kg cart across a 15.0-m level surface.If the cart accelerates at 2.0 m/s²,then what is the work done by the force of friction as it acts to retard the motion of the cart?

(Multiple Choice)

4.8/5

(79)

Question 79

A Hooke's law spring is compressed 14.6 cm from equilibrium,and the potential energy stored is 76.0 J.What compression (as measured from equilibrium)would result in 100 J being stored in this case?

(Multiple Choice)

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Question 80

Showing 61 - 80 of 102

Exam 5: Energy

A parachutist of mass 50.0 kg jumps out of an airplane at a height of 1 040 m.The parachute deploys,and she lands on the ground with a speed of 4.0 m /s.How much energy was lost to air friction during this jump?

​A box slides across a floor and comes to rest.The work done by the frictional force on the box is

An amount of work equal to 2.0 J is required to compress the spring in a spring-gun.What is the "launch speed" of a 26.0-g marble?

A horse pulls a 350-kg sled at constant speed along an icy road for a distance of 500 m.If the coefficient of kinetic friction between the sled and the road is 0.450,and the angle between the harness and the sled is 25°,what is the mechanical energy lost due to friction?

Three different-mass projectiles are launched from the top of a building each at different angles of elevation.Each particle has the same initial kinetic energy.Which particle has the greatest kinetic energy just as it impacts with the ground?

A pendulum consists of a mass m suspended from a string of length L.When the pendulum is swinging,how much greater is the mass's potential energy when the string is displaced from the vertical by the angle θ than when the mass is at the lowest position?

A 35.0-N crate is pulled up a 4.0-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 25.0 N between the crate and the surface,what is the force applied by the worker?

A baseball catcher puts on an exhibition by catching a 0.200-kg ball dropped from a helicopter at a height of 150 m above the catcher.If the catcher "gives" with the ball for a distance of 0.755 m while catching it,what average force is exerted on the mitt by the ball? (g = 9.80 m/s2)

In a problem using energy considerations to solve for the speed of a ball thrown from the top of a building when it strikes the ground below,where should the potential energy have its zero value?

A 26.0-N crate starting at rest slides down a rough 4.8-m-long ramp,inclined at 21.0° with the horizontal.18 J of energy is lost to friction.What will be the speed of the crate at the bottom of the incline?

A bobsled makes a run down an ice track starting at 250 m vertical distance up the hill.If there is no friction,what is the velocity at the bottom of the hill?

As an object is lowered into a deep hole in the surface of the Earth,which of the following must be assumed in regard to its potential energy?

What is the minimum amount of energy required for a 60.0-kg climber carrying a 18-kg pack to climb Mt.Everest,8 250 m high?

Petra pushes a crate across a rough floor.A frictional force of 28.0 N acts to oppose the motion of the crate,and Petra pushes with a horizontal force of 36.4 N.If the net work Petra does is 94.5 J,through what distance did she push the crate?

When a Hooke's law spring is stretched a distance 3x,how much is the increase in energy stored in it from when it was stretched a distance x? Give your answer in terms of a multiple of the energy stored in the spring when it is stretched a distance x.

Two blocks are released from the top of a building.One falls straight down while the other slides down a smooth ramp.If all friction is ignored,which one is moving faster when it reaches the bottom?

A rock is thrown straight up with an initial velocity of 15.0 m/s.Ignore energy lost to air friction.How high will the rock rise?

A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position.Under the same compression d,the spring is now used to launch a mass of 2m.How high does this second mass rise?

A horizontal force of 200 N is applied to a 55.0-kg cart across a 15.0-m level surface.If the cart accelerates at 2.0 m/s2,then what is the work done by the force of friction as it acts to retard the motion of the cart?

A Hooke's law spring is compressed 14.6 cm from equilibrium,and the potential energy stored is 76.0 J.What compression (as measured from equilibrium)would result in 100 J being stored in this case?

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A box slides across a floor and comes to rest.The work done by the frictional force on the box is

A baseball catcher puts on an exhibition by catching a 0.200-kg ball dropped from a helicopter at a height of 150 m above the catcher.If the catcher "gives" with the ball for a distance of 0.755 m while catching it,what average force is exerted on the mitt by the ball? (g = 9.80 m/s²)

A horizontal force of 200 N is applied to a 55.0-kg cart across a 15.0-m level surface.If the cart accelerates at 2.0 m/s²,then what is the work done by the force of friction as it acts to retard the motion of the cart?