Question 1

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

Accepted Answer

A) zero. 
B) doubled. 
C) quadrupled. 
D) unchanged. 
A) zero. 
B) doubled. 
C) quadrupled. 
D) unchanged.

Question 2

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

Accepted Answer

A) 8 J. 
B) 20 J. 
C) 60 J. 
D) 80 J. 
E) none of the above 
A) 8 J. 
B) 20 J. 
C) 60 J. 
D) 80 J. 
E) none of the above

Question 3

The ultimate source of energy from fossil fuels is the

Accepted Answer

A) Sun. 
B) radioactivity in Earth's interior. 
C) photosynthesis process. 
D) natural processes in Earth's interior. 
A) Sun. 
B) radioactivity in Earth's interior. 
C) photosynthesis process. 
D) natural processes in Earth's interior.

Question 4

An object may have potential energy because of its

Accepted Answer

A) speed. 
B) acceleration. 
C) momentum. 
D) location. 
E) none of the above 
A) speed. 
B) acceleration. 
C) momentum. 
D) location. 
E) none of the above

Question 5

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

Accepted Answer

A) 40 J. 
B) 80 J. 
C) 160 J. 
D) not enough information 
A) 40 J. 
B) 80 J. 
C) 160 J. 
D) not enough information

Question 6

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

Accepted Answer

A) the lovebug 
B) your car 
C) both the same 
A) the lovebug 
B) your car 
C) both the same

Question 7

A simple machine CANNOT multiply

Accepted Answer

A) force. 
B) distance. 
C) energy. 
D) none of the above 
A) force. 
B) distance. 
C) energy. 
D) none of the above

Question 8

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

Accepted Answer

A) 4 times the kinetic energy. 
B) 8 times the kinetic energy. 
C) 12 times the kinetic energy. 
D) 16 times the kinetic energy. 
A) 4 times the kinetic energy. 
B) 8 times the kinetic energy. 
C) 12 times the kinetic energy. 
D) 16 times the kinetic energy.

Question 9

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

Accepted Answer

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

Question 10

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?

Accepted Answer

A) 4 m/s 
B) 5 m/s 
C) 6 m/s 
D) 8 m/s 
E) none of the above 
A) 4 m/s 
B) 5 m/s 
C) 6 m/s 
D) 8 m/s 
E) none of the above

Question 11

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

Accepted Answer

A) 0.5 m/s. 
B) 0.33 m/s. 
C) 0.67 m/s. 
D) 1.0 m/s. 
E) none of the above 
A) 0.5 m/s. 
B) 0.33 m/s. 
C) 0.67 m/s. 
D) 1.0 m/s. 
E) none of the above

Question 12

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

Accepted Answer

A) 50 N. 
B) 500 N. 
C) 5000 N. 
D) not enough information 
A) 50 N. 
B) 500 N. 
C) 5000 N. 
D) not enough information

Question 13

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?

Accepted Answer

A) 30 km 
B) 40 km 
C) 50 km 
D) more than 50 km 
E) not enough information 
A) 30 km 
B) 40 km 
C) 50 km 
D) more than 50 km 
E) not enough information

Question 14

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

Accepted Answer

A) 90%. 
B) 60%. 
C) 30%. 
D) 18%. 
E) none of the above 
A) 90%. 
B) 60%. 
C) 30%. 
D) 18%. 
E) none of the above

Question 15

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

Accepted Answer

A) true. 
B) true only if the engine is running. 
C) always false 
D) sometimes true, sometimes false 
A) true. 
B) true only if the engine is running. 
C) always false 
D) sometimes true, sometimes false

Question 16

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

Accepted Answer

A) decreases. 
B) is unchanged. 
C) increases. 
A) decreases. 
B) is unchanged. 
C) increases.

Question 17

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

Accepted Answer

A) 1/2 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) 2/3 m/s. 
E) 3/2 m/s. 
A) 1/2 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) 2/3 m/s. 
E) 3/2 m/s.

Question 18

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

Accepted Answer

A) less than 1 unit. 
B) more than 1 unit. 
C) 1 unit. 
D) not enough information 
A) less than 1 unit. 
B) more than 1 unit. 
C) 1 unit. 
D) not enough information

Question 19

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

Accepted Answer

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

Question 20

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

Accepted Answer

A) 0.08 N. 
B) 0.8 N. 
C) 8.0 N. 
D) 80 N. 
A) 0.08 N. 
B) 0.8 N. 
C) 8.0 N. 
D) 80 N.

Exam 3: Momentum and Energy

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

The ultimate source of energy from fossil fuels is the

An object may have potential energy because of its

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

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

A simple machine CANNOT multiply

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

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

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?

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

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?

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

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

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

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

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

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

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

Patterns of Motion and Equilibrium

Newtons Laws of Motion

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

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