Question 1

If a charging rhinoceros has momentum,it must also have

Accepted Answer

A) potential energy. 
B) kinetic energy. 
C) work. 
D) all of the above 
A) potential energy. 
B) kinetic energy. 
C) work. 
D) all of the above

Question 2

The impulse-momentum relationship is a direct result of

Accepted Answer

A) Newton's first law. 
B) Newton's second law. 
C) Newton's third law. 
A) Newton's first law. 
B) Newton's second law. 
C) Newton's third law.

Question 3

A music console is pushed 2 m by a force of 20 N.The work done on the console is

Accepted Answer

A) 2 J. 
B) 10 J. 
C) 20 J. 
D) 40 J. 
E) 80 J. 
A) 2 J. 
B) 10 J. 
C) 20 J. 
D) 40 J. 
E) 80 J.

Question 4

The most energy per unit mass can be extracted from

Accepted Answer

A) coal. 
B) petroleum. 
C) natural gas. 
D) uranium. 
A) coal. 
B) petroleum. 
C) natural gas. 
D) uranium.

Question 5

A common car engine is 20% efficient.When cruising,the car encounters an average retarding force of 1000 N.If the energy content of gasoline is 40 MJ/L,how many kilometers per liter does the car achieve?

Accepted Answer

A) 14 km/L 
B) 12 km/L 
C) 10 km/L 
D) 8 km/L 
E) none of the above 
A) 14 km/L 
B) 12 km/L 
C) 10 km/L 
D) 8 km/L 
E) none of the above

Question 6

A jack system will increase the potential energy of a heavy load by no more than 1000 J with a work input of 2000 J.The efficiency of the jack system is at most

Accepted Answer

A) 10%. 
B) 20%. 
C) 50%. 
D) 80%. 
E) not enough information 
A) 10%. 
B) 20%. 
C) 50%. 
D) 80%. 
E) not enough information

Question 7

When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard,he doesn't slip off the skateboard because of

Accepted Answer

A) inertia in motion. 
B) momentum change. 
C) friction between his feet and the board. 
A) inertia in motion. 
B) momentum change. 
C) friction between his feet and the board.

Question 8

A diesel locomotive coasting at 10 km/h has an inelastic collision with a stationary flatcar.The locomotive weighs four times as much as the flatcar.How fast does the locomotive-flatcar combination move when stuck together?

Accepted Answer

Momentum before collision = momentum aft

Question 9

An unfortunate bug splatters on the windshield of a moving car.Describe the forces,impulses,momentum changes,and accelerations of both the bug and the car.

Accepted Answer

According to Newton's third law,the forc

Question 10

A car moving at 50 km/h skids 20 m with locked brakes.How far will it skid if its initial speed is 150 km/h?

Accepted Answer

A) 20 m 
B) 60 m 
C) 90 m 
D) 180 m 
A) 20 m 
B) 60 m 
C) 90 m 
D) 180 m

Question 11

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

Accepted Answer

A) 1/4 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) none of the above 
E) not enough information 
A) 1/4 m/s. 
B) 1/5 m/s. 
C) 1/6 m/s. 
D) none of the above 
E) not enough information

Question 12

The force of air impact upon the sail of a boat is greater if the air

Accepted Answer

A) bounces upon impact. 
B) encounters the sail head-on. 
C) encounters the sail at a grazing angle. 
A) bounces upon impact. 
B) encounters the sail head-on. 
C) encounters the sail at a grazing angle.

Question 13

A boy fires a spring-loaded Ping-Pong ball gun.Briefly compare the forces and impulses on the gun and the ball.Which has more momentum? Which moves faster?

Accepted Answer

Both force and impulse on both the ball

Question 14

When a boxer moves into an oncoming punch,the force experienced is

Accepted Answer

A) decreased. 
B) increased. 
C) no different,but the timing is different. 
D) all of the above 
A) decreased. 
B) increased. 
C) no different,but the timing is different. 
D) all of the above

Question 15

A karate expert executes a swift blow and breaks a cement block with her bare hand.The magnitude of the force on her hand is

Accepted Answer

A) zero. 
B) less than the force applied to the cement block. 
C) the same as the force applied to the block. 
D) more than the force applied to the block. 
E) need more information 
A) zero. 
B) less than the force applied to the cement block. 
C) the same as the force applied to the block. 
D) more than the force applied to the block. 
E) need more information

Question 16

You throw a golf ball at a massive bowling ball at rest and the golf ball bounces backward from it.After the bounce,compared with the golf ball,the bowling ball has more

Accepted Answer

A) momentum,but less kinetic energy. 
B) kinetic energy,but less momentum. 
C) momentum and more kinetic energy. 
D) less momentum and less kinetic energy. 
E) not enough information 
A) momentum,but less kinetic energy. 
B) kinetic energy,but less momentum. 
C) momentum and more kinetic energy. 
D) less momentum and less kinetic energy. 
E) not enough information

Question 17

A sandbag is motionless in outer space.A second sandbag with 3 times the mass moving at 12 m/s collides with it and they both stick together and move at a speed of

Accepted Answer

A) 3 m/s. 
B) 4 m/s. 
C) 6 m/s. 
D) 8 m/s. 
E) none of the above 
A) 3 m/s. 
B) 4 m/s. 
C) 6 m/s. 
D) 8 m/s. 
E) none of the above

Question 18

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 19

A 30-kg girl on friction-free roller blades pushes away a 25-kg boy also on roller blades at 1 m/s.The girl's speed is

Accepted Answer

A) 0.45 m/s. 
B) 0.55 m/s. 
C) 0.83 m/s. 
D) 1.2 m/s. 
A) 0.45 m/s. 
B) 0.55 m/s. 
C) 0.83 m/s. 
D) 1.2 m/s.

Question 20

The amount of potential energy possessed by an elevated object is

Accepted Answer

A) relative to a chosen reference level. 
B) equal to the work done in lifting it. 
C) equal to the kinetic energy it will acquire when freely falling to its reference level. 
D) all of the above 
A) relative to a chosen reference level. 
B) equal to the work done in lifting it. 
C) equal to the kinetic energy it will acquire when freely falling to its reference level. 
D) all of the above

Exam 3: Momentum and Energy

If a charging rhinoceros has momentum,it must also have

The impulse-momentum relationship is a direct result of

A music console is pushed 2 m by a force of 20 N.The work done on the console is

The most energy per unit mass can be extracted from

A common car engine is 20% efficient.When cruising,the car encounters an average retarding force of 1000 N.If the energy content of gasoline is 40 MJ/L,how many kilometers per liter does the car achieve?

A jack system will increase the potential energy of a heavy load by no more than 1000 J with a work input of 2000 J.The efficiency of the jack system is at most

When Freddy Frog drops vertically from a tree onto a horizontally-moving skateboard,he doesn't slip off the skateboard because of

A diesel locomotive coasting at 10 km/h has an inelastic collision with a stationary flatcar.The locomotive weighs four times as much as the flatcar.How fast does the locomotive-flatcar combination move when stuck together?

An unfortunate bug splatters on the windshield of a moving car.Describe the forces,impulses,momentum changes,and accelerations of both the bug and the car.

A car moving at 50 km/h skids 20 m with locked brakes.How far will it skid if its initial speed is 150 km/h?

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

The force of air impact upon the sail of a boat is greater if the air

A boy fires a spring-loaded Ping-Pong ball gun.Briefly compare the forces and impulses on the gun and the ball.Which has more momentum? Which moves faster?

When a boxer moves into an oncoming punch,the force experienced is

A karate expert executes a swift blow and breaks a cement block with her bare hand.The magnitude of the force on her hand is

You throw a golf ball at a massive bowling ball at rest and the golf ball bounces backward from it.After the bounce,compared with the golf ball,the bowling ball has more

A sandbag is motionless in outer space.A second sandbag with 3 times the mass moving at 12 m/s collides with it and they both stick together and move at a speed of

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

A 30-kg girl on friction-free roller blades pushes away a 25-kg boy also on roller blades at 1 m/s.The girl's speed is

The amount of potential energy possessed by an elevated object 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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