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Exam 3: Momentum and Energy

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Question 21

Multiple Choice

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A 2-kg mass that weighs 20 N has 40 J of potential energy relative to the ground. What is its height?

A) 1 m
B) 2 m
C) 3 m
D) 4 m
E) none of the above

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Question 22

Multiple Choice

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

A) twice as far.
B) four times as far.
C) depends on the mass of the cars

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Question 23

Multiple Choice

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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 ultimate source of energy from fossil fuels is the

You're driving down the highway and a lovebug spatters onto your windshield. Which undergoes the greater impulse?

A simple machine CANNOT multiply

If a power plant is 30% efficient, and the transmission system that delivers power to consumers is 60% efficient, then the overall efficiency is

An object may have potential energy because of its

A boxer punches a sheet of paper in midair from rest to a speed of 40 m/s in 0.05 s. If the mass of the paper is 0.01 kg, the force of the punch on the paper is

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

When bullets are fired from an airplane in the forward direction of motion, the momentum of the airplane

A 2-kg mass weighs 20 N and is held 4 m above the ground. Its potential energy relative to the ground is

Two identical freight cars roll without friction towards each other on a level track. One car rolls at 2 m/s and the other car rolls at 1 m/s. After the cars collide, they couple and roll together with a speed of

Strictly speaking, if any electrical device in an automobile is turned on (such as an air conditioner, headlights, or radio) , more fuel is consumed by the engine. This statement is

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

A 5000-kg freight car crashes 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 freight car?

A shopping cart moves with a kinetic energy of 40 J. If it moves at twice the speed, its kinetic energy is

A 5-kg fish swimming at a speed of 1 m/s swallows an absent-minded 1-kg fish swimming toward it at 4 m/s. The speed of the larger fish after lunch is

In raising a 5000-N piano with a pulley system, for every 1 m of rope pulled down, the piano rises 0.1 m. Ideally, this means the force needed to lift the piano is

Suppose a miracle car has a 100% efficient engine and burns fuel having an energy content of 40 MJ/L. If the air resistance and overall frictional forces on this car traveling at highway speeds is 1000 N, what is the overall limit in distance per liter driven on the highway?