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Exam 4: Momentum and Energy

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Question 21

Multiple Choice

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The power expended when a barbell is raised 2.0 m in 2 s is

A) 1 W.
B) 4 W.
C) 8 W.
D) dependent on the mass of the barbell.

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Question 22

Multiple Choice

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A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish at rest. The speed of the larger fish after lunch is

A) 1/2 m/s.
B) 2/5 m/s.
C) 5/6 m/s.
D) 6/5 m/s.
E) 1 m/s.

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Question 23

Multiple Choice

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A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is

When a car is braked to a stop, its kinetic energy is transformed to

A moving object on which no forces are acting will continue to move with constant

A 5000-kg freight car runs into a 10,000-kg freight car at rest. They couple upon collision and move with a speed of 2 m/s. What was the initial speed of the 5000-kg car?

No work is done by gravity on a bowling ball that rolls along a bowling alley because

Consider driving into a massive concrete wall with no "give," versus having a head-on collision at the same speed with an identical car moving toward you at the same speed. It would be more damaging to hit the

Can an object have mechanical energy without having momentum? Momentum without having energy? Explain.

When a rifle is fired, it recoils so both the bullet and rifle are set in motion. The rifle and bullet ideally acquire equal

A car that travels twice as fast as another when braking to a stop will skid

A 1-kg chunk of putty moving at 1 m/s collides with and sticks to a 5-kg bowling ball that is initially at rest. The bowling ball and putty are then set in motion with a speed of

Suppose you are at the edge of a cliff and you throw one ball downward and another upward at the same speed. Which will hit the ground faster? Does it make a difference in which direction the ball is thrown? Explain.

A piece of putty moving with 1 unit of momentum strikes and sticks to a heavy bowling ball that is initially at rest. After the putty sticks to the ball, both move with a combined momentum of

The difference between impulse and impact force involves the

In terms of momentum, why is a glass less likely to break if it falls on a carpeted floor compared with falling on a hard concrete floor?

A railroad diesel engine coasting at 10 km/h runs into a stationary flatcar. The diesel weighs four times as much as the flatcar. How fast do the cars move when they stick together upon collision?

The force on an apple hitting the ground depends upon

A person on the edge of a roof throws a ball downward. It strikes the ground with 100 J of kinetic energy. The person throws an identical ball upward with the same initial speed, and this too falls to the ground. Neglecting air resistance, the second ball hits the ground with a kinetic energy of

You do work on a body when you lift it against gravity. How does this work relate to gravitational potential energy? If the lifted body is dropped, what becomes of this energy?