Question 1

The source of Earth's internal energy involves

Accepted Answer

A) kinetic energy. 
B) potential energy. 
C) radioactivity. 
D) the Sun. 
A) kinetic energy. 
B) potential energy. 
C) radioactivity. 
D) the Sun. C

Question 2

While driving down the highway 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 C

Question 3

A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact.The boat

Accepted Answer

A) moves in the direction of the wind impact force. 
B) does not move by this wind impact. 
C) moves,but in the opposite direction of the wind impact force. 
A) moves in the direction of the wind impact force. 
B) does not move by this wind impact. 
C) moves,but in the opposite direction of the wind impact force. A

Question 4

A pulley system can

Accepted Answer

A) change the direction of a force. 
B) multiply a force. 
C) both of these 
D) none of the above 
A) change the direction of a force. 
B) multiply a force. 
C) both of these 
D) none of the above

Question 5

After rolling half-way down an incline,a marble's kinetic energy is

Accepted Answer

A) less than its potential energy. 
B) greater than its potential energy. 
C) the same as its potential energy. 
A) less than its potential energy. 
B) greater than its potential energy. 
C) the same as its potential energy.

Question 6

A melon is tossed straight upward with 100 J of kinetic energy.If air resistance is negligible the melon will return to its initial level with a kinetic energy of

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 7

The change in momentum of an object is equal to the

Accepted Answer

A) force acting on it. 
B) change in its velocity. 
C) object's mass times the force acting on it. 
D) impulse that acts on it. 
E) all of the above 
A) force acting on it. 
B) change in its velocity. 
C) object's mass times the force acting on it. 
D) impulse that acts on it. 
E) all of the above

Question 8

A hydraulic jack is used to lift an automobile.If the input force is 200 N over a distance of 1 meter,the output force over a distance of 0.1 meter is ideally

Accepted Answer

A) 200 N. 
B) 500 N. 
C) 1000 N. 
D) 2000 N. 
E) none of the above 
A) 200 N. 
B) 500 N. 
C) 1000 N. 
D) 2000 N. 
E) none of the above

Question 9

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

Accepted Answer

A) no force acts on the ball. 
B) no distance is covered by the ball. 
C) the force on the ball is at right angles to its motion. 
D) no potential energy converts to kinetic energy. 
E) its kinetic energy may vary. 
A) no force acts on the ball. 
B) no distance is covered by the ball. 
C) the force on the ball is at right angles to its motion. 
D) no potential energy converts to kinetic energy. 
E) its kinetic energy may vary.

Question 10

A cannonball fired from a long-barrel cannon will have a greater muzzle velocity because the cannonball receives a greater

Accepted Answer

A) force. 
B) impulse. 
C) both of these 
D) none of the above 
A) force. 
B) impulse. 
C) both of these 
D) none of the above

Question 11

When you ride your scooter you have momentum.When you ride twice as fast you have

Accepted Answer

A) almost twice the momentum. 
B) twice the momentum. 
C) four times the momentum. 
D) none of the above 
A) almost twice the momentum. 
B) twice the momentum. 
C) four times the momentum. 
D) none of the above

Question 12

To catch a fast-moving softball with your bare hand,you extend your hand forward just before the catch and then let the ball ride backward with your hand.Doing this reduces the catching force because the

Accepted Answer

A) relative velocity is less. 
B) relative velocity is more. 
C) time of catch is increased. 
D) time of the catch is decreased. 
E) none of the above 
A) relative velocity is less. 
B) relative velocity is more. 
C) time of catch is increased. 
D) time of the catch is decreased. 
E) none of the above

Question 13

Using 1000 J of work,a toy elevator is raised from the ground floor to the second floor in 20 s.How much power does the elevator use?

Accepted Answer

A) 20 W 
B) 50 W 
C) 100 W 
D) 1000 W 
E) 20,000 W 
A) 20 W 
B) 50 W 
C) 100 W 
D) 1000 W 
E) 20,000 W

Question 14

A 2500-N pile driver ram falls 10 m and drives a post 0.1 m into the ground.The average force on the post is

Accepted Answer

A) 2500 N. 
B) 25,000 N. 
C) 250,000 N. 
D) 2,500,000 N. 
A) 2500 N. 
B) 25,000 N. 
C) 250,000 N. 
D) 2,500,000 N.

Question 15

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 16

A 5-kg fish swimming at 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 17

When a hydraulic press is properly used it is capable of multiplying force input.

Accepted Answer

A) true 
B) false 
C) true only in special cases,energy as well 
A) true 
B) false 
C) true only in special cases,energy as well

Question 18

Give two explanations of why a cannonball fired from a long-barrel cannon will have a greater velocity than from a shorter cannon.

Accepted Answer

In terms of impulse-momentum,the longer

Question 19

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 20

A straw is used for a pea shooter.When you blow through the straw the speed of the emerging pea will be greater if the straw is

Accepted Answer

A) cut in half. 
B) full length. 
C) either cut in half or full length. 
A) cut in half. 
B) full length. 
C) either cut in half or full length.

Exam 3: Momentum and Energy

The source of Earth's internal energy involves

While driving down the highway a lovebug spatters onto your windshield.Which undergoes the greater impulse?

A fan attached to an ice sailcraft stalled on a windless day blows air into the sail that bounces backward upon impact.The boat

A pulley system can

After rolling half-way down an incline,a marble's kinetic energy is

A melon is tossed straight upward with 100 J of kinetic energy.If air resistance is negligible the melon will return to its initial level with a kinetic energy of

The change in momentum of an object is equal to the

A hydraulic jack is used to lift an automobile.If the input force is 200 N over a distance of 1 meter,the output force over a distance of 0.1 meter is ideally

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

A cannonball fired from a long-barrel cannon will have a greater muzzle velocity because the cannonball receives a greater

When you ride your scooter you have momentum.When you ride twice as fast you have

To catch a fast-moving softball with your bare hand,you extend your hand forward just before the catch and then let the ball ride backward with your hand.Doing this reduces the catching force because the

Using 1000 J of work,a toy elevator is raised from the ground floor to the second floor in 20 s.How much power does the elevator use?

A 2500-N pile driver ram falls 10 m and drives a post 0.1 m into the ground.The average force on the post is

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 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

When a hydraulic press is properly used it is capable of multiplying force input.

Give two explanations of why a cannonball fired from a long-barrel cannon will have a greater velocity than from a shorter cannon.

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

A straw is used for a pea shooter.When you blow through the straw the speed of the emerging pea will be greater if the straw 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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