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Exam 7: Energy

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Question 41

Multiple Choice

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A block of ice sliding down an incline has its maximum speed at

A) the top.
B) the bottom.
C) halfway down.
D) difficult to predict without knowing the slope of the incline
E) difficult to predict without knowing the coefficient of friction

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Question 42

Multiple Choice

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A motorcycle with a mass of 100 kilograms slowly rolls over the edge of a cliff and falls for three seconds before it reaches the bottom of a gully.Its momentum (in units of kilogram meters per second) just before it hit bottom and became burned rubber and scrap metal was

A) 1,000.
B) 2,000.
C) 3,000.
D) 4,000.
E) 9,000.

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Question 43

Multiple Choice

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A light aluminum ball and a heavy lead ball of the same size are allowed to roll down an incline.When they are halfway down the incline,they will have identical

Two identical 5000-kg bulldozers roll toward each other on a level road without friction (one at 1 m/s,the other at 2 m/s) Just before they collide,one has a kinetic energy of 2500 J and the other 10,000 J.At this instant their total kinetic energy is

If a ping pong ball and a golf ball are both moving in the same direction with the same amount of kinetic energy,the speed of the ping pong ball must be

If you push for a half hour or a whole hour against a stationary wall

A hydraulic press,like an inclined plane,is capable of increasing energy.

When an object is in motion,which of the following could not have a value of zero?

Whereas impulse involves the time that a force acts,work involves the

Two identical arrows,one with twice the speed of the other,are fired into a hay bale.The faster arrow will penetrate

A car moves 4 times as fast as another identical car.Compared to the slower car,the faster car has

Two pool balls,each moving at 2 m/s,roll toward each other and collide.Suppose after bouncing apart,each moves at 4 m/s.This collision violates conservation of

It takes 40 J to push a large box 4 m across a floor.Assuming the push is in the same direction as the move,what is the magnitude of the force on the box?

A piece of taffy slams into and sticks to another identical piece of taffy that is at rest.The momentum of the two pieces stuck together after the collision is the same as it was before the collision,but this is not true of the kinetic energy,which is partly turned into heat.What percentage of the kinetic energy is turned into heat?

Which has greater kinetic energy,a car traveling at 30 km/hr or a car of half the mass traveling at 60 km/hr?

A 1-kg ball dropped from a height of 2 m rebounds only 1.5 m after hitting the ground.The amount of energy converted to heat is about

A car's engine is 20% efficient.When cruising,the car encounters an average retarding force of 1000 N.If the energy content of gasoline is 40 megajoules per liter,how many kilometers per liter does the car get?

An object that has kinetic energy must be

A job is done slowly,while an identical job is done quickly.Both jobs require the same amount of work,but different amounts of

If you push an object twice as far while applying the same force,you do