Question 1

Which of these forms of energy is not renewable?

Accepted Answer

A) wind power 
B) solar power 
C) fossil fuel power 
D) photovoltaic power 
A) wind power 
B) solar power 
C) fossil fuel power 
D) photovoltaic power

Question 2

A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance.When it returns to its initial level its kinetic energy is

Accepted Answer

A) less than 100 J. 
B) more than 100 J. 
C) 100 J. 
D) need more information 
A) less than 100 J. 
B) more than 100 J. 
C) 100 J. 
D) need more information

Question 3

When a cannon fires a cannonball at a given speed,the smaller recoil speed of the cannon is due to differences in

Accepted Answer

A) forces. 
B) times. 
C) masses. 
D) momenta. 
A) forces. 
B) times. 
C) masses. 
D) momenta.

Question 4

A ball rolling down an incline has its maximum kinetic energy at

Accepted Answer

A) the top. 
B) half-way down. 
C) three-quarters of the way down. 
D) the bottom. 
A) the top. 
B) half-way down. 
C) three-quarters of the way down. 
D) the bottom.

Question 5

The order in which solar energy is converted to the kinetic energy of an automobile is

Accepted Answer

A) photocells,electrolysis,motor,fuel cells,kinetic energy. 
B) photocells,electrolysis,fuels cells,motor,kinetic energy. 
C) electrolysis,fuel cells,photocells,motor,kinetic energy. 
A) photocells,electrolysis,motor,fuel cells,kinetic energy. 
B) photocells,electrolysis,fuels cells,motor,kinetic energy. 
C) electrolysis,fuel cells,photocells,motor,kinetic energy.

Question 6

The unit kilowatt-hour is a unit of

Accepted Answer

A) energy. 
B) momentum. 
C) power. 
D) time. 
A) energy. 
B) momentum. 
C) power. 
D) time.

Question 7

What is the speed of a 4-kg ball with a momentum of 12 kg∙m/s?

Accepted Answer

A) 3 m/s 
B) 4 m/s 
C) 12 m/s 
D) 48 m/s 
E) none of the above 
A) 3 m/s 
B) 4 m/s 
C) 12 m/s 
D) 48 m/s 
E) none of the above

Question 8

The total momentum of a flock of identical birds could be zero only if the birds are

Accepted Answer

A) taking off from the ground. 
B) flying in the same direction. 
C) flying in different directions. 
D) very tired and coming down to rest. 
A) taking off from the ground. 
B) flying in the same direction. 
C) flying in different directions. 
D) very tired and coming down to rest.

Question 9

Whether a truck comes to a stop by crashing into a haystack or a brick wall,the stopping force is

Accepted Answer

A) greater with the haystack. 
B) greater with the brick wall. 
C) both the same 
A) greater with the haystack. 
B) greater with the brick wall. 
C) both the same

Question 10

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

Accepted Answer

A) sometimes true 
B) always false 
C) always true 
D) sometimes false 
A) sometimes true 
B) always false 
C) always true 
D) sometimes false

Question 11

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 12

Jogging Jake runs along the top of a moving flatcar in the direction of motion of the flatcar.If he runs in the opposite direction,the combined momentum of Jake and the flatcar relative to an observer at rest will be

Accepted Answer

A) more. 
B) the same. 
C) less. 
A) more. 
B) the same. 
C) less.

Question 13

A 1000-kg truck moving at 10 m/s that brakes to a stop in 5 s has an average braking force of

Accepted Answer

A) 1000 N. 
B) 2000 N. 
C) 3000 N. 
D) 4000 N. 
E) 5000 N. 
A) 1000 N. 
B) 2000 N. 
C) 3000 N. 
D) 4000 N. 
E) 5000 N.

Question 14

A machine puts out 100 W of power for every 1000 W put into it.The efficiency of the machine is

Accepted Answer

A) 10%. 
B) 50%. 
C) 90%. 
D) 110%. 
E) none of the above 
A) 10%. 
B) 50%. 
C) 90%. 
D) 110%. 
E) none of the above

Question 15

While driving down the highway a lovebug spatters onto your windshield.Which undergoes the greater change in momentum during the time of contact?

Accepted Answer

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

Question 16

If you exert 6 N across a distance of 2 m in 3 s you'll deliver a power of

Accepted Answer

A) 1 W. 
B) 3 W. 
C) 4 W. 
D) 6 W. 
E) more than 6 W 
A) 1 W. 
B) 3 W. 
C) 4 W. 
D) 6 W. 
E) more than 6 W

Question 17

Which requires more work: lifting a 50-kg sack vertically 2 m or lifting a 25-kg sack vertically 4 m?

Accepted Answer

A) lifting the 50-kg sack 
B) lifting the 25-kg sack 
C) both require the same amount of work 
A) lifting the 50-kg sack 
B) lifting the 25-kg sack 
C) both require the same amount of work

Question 18

Two billiard balls having the same mass roll toward each other at the same speed.What is the net momentum of the two-ball system?

Accepted Answer

A) 0 kg∙m/s 
B) 10 kg∙m/s 
C) not enough information 
A) 0 kg∙m/s 
B) 10 kg∙m/s 
C) not enough information

Question 19

A clerk can lift containers a vertical distance of 1 m,or roll them up a 2-m-long ramp to the same elevation.With the ramp,the applied force needed is

Accepted Answer

A) half as much. 
B) twice as much. 
C) the same. 
A) half as much. 
B) twice as much. 
C) the same.

Question 20

A heavy truck and a small car roll down a hill at the same speed and need to stop in the same amount of time.Compared with the force to stop the car,the force needed to stop the truck is

Accepted Answer

A) greater. 
B) smaller. 
C) the same. 
A) greater. 
B) smaller. 
C) the same.

Exam 3: Momentum and Energy

Which of these forms of energy is not renewable?

A melon is projected into the air with 100 J of kinetic energy in the presence of air resistance.When it returns to its initial level its kinetic energy is

When a cannon fires a cannonball at a given speed,the smaller recoil speed of the cannon is due to differences in

A ball rolling down an incline has its maximum kinetic energy at

The order in which solar energy is converted to the kinetic energy of an automobile is

The unit kilowatt-hour is a unit of

What is the speed of a 4-kg ball with a momentum of 12 kg∙m/s?

The total momentum of a flock of identical birds could be zero only if the birds are

Whether a truck comes to a stop by crashing into a haystack or a brick wall,the stopping force is

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

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

Jogging Jake runs along the top of a moving flatcar in the direction of motion of the flatcar.If he runs in the opposite direction,the combined momentum of Jake and the flatcar relative to an observer at rest will be

A 1000-kg truck moving at 10 m/s that brakes to a stop in 5 s has an average braking force of

A machine puts out 100 W of power for every 1000 W put into it.The efficiency of the machine is

While driving down the highway a lovebug spatters onto your windshield.Which undergoes the greater change in momentum during the time of contact?

If you exert 6 N across a distance of 2 m in 3 s you'll deliver a power of

Which requires more work: lifting a 50-kg sack vertically 2 m or lifting a 25-kg sack vertically 4 m?

Two billiard balls having the same mass roll toward each other at the same speed.What is the net momentum of the two-ball system?

A clerk can lift containers a vertical distance of 1 m,or roll them up a 2-m-long ramp to the same elevation.With the ramp,the applied force needed is

A heavy truck and a small car roll down a hill at the same speed and need to stop in the same amount of time.Compared with the force to stop the car,the force needed to stop the truck 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 Time - Reading 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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