Question 1

A 60-kg woman climbs a mountain 2000 m high in 10 h.Her average power output during the climb is

Accepted Answer

A) 3.3 W. 
B) 33 W. 
C) 1960 W. 
D) 117.6 kW. 
A) 3.3 W. 
B) 33 W. 
C) 1960 W. 
D) 117.6 kW. B

Question 2

Rolling a ball up an inclined plank requires an amount of work proportional to the

Accepted Answer

A) horizontal distance the ball is shifted. 
B) height the ball is raised. 
C) sum of the horizontal distance the ball is shifted and the height the ball is raised. 
D) length of the plank. 
A) horizontal distance the ball is shifted. 
B) height the ball is raised. 
C) sum of the horizontal distance the ball is shifted and the height the ball is raised. 
D) length of the plank. B

Question 3

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage has an initial speed of

Accepted Answer

A) 8 km/h. 
B) 40 km/h. 
C) 56 km/h. 
D) 60 km/h. 
A) 8 km/h. 
B) 40 km/h. 
C) 56 km/h. 
D) 60 km/h. C

Question 4

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

Accepted Answer

A) 10.2 cm. 
B) 1 m. 
C) 9.8 m. 
D) 98 m. 
A) 10.2 cm. 
B) 1 m. 
C) 9.8 m. 
D) 98 m.

Question 5

A total of 4900 J is expended in lifting a 50-kg mass.The mass is raised to a height of

Accepted Answer

A) 10 m. 
B) 98 m. 
C) 960 m. 
D) 245,000 m. 
A) 10 m. 
B) 98 m. 
C) 960 m. 
D) 245,000 m.

Question 6

According to the general theory of relativity, gravitation

Accepted Answer

A) acts only on moving bodies. 
B) is really a general acceleration of the universe. 
C) is a distortion in space-time. 
D) is the same as in Newton's theory but is to be interpreted differently. 
A) acts only on moving bodies. 
B) is really a general acceleration of the universe. 
C) is a distortion in space-time. 
D) is the same as in Newton's theory but is to be interpreted differently.

Question 7

A rocket is fired in space.As it moves, the total momentum of the rocket and its exhaust gases

Accepted Answer

A) decreases. 
B) remains the same. 
C) increases. 
D) Any of the choices could be correct, depending on the nature of the rocket. 
A) decreases. 
B) remains the same. 
C) increases. 
D) Any of the choices could be correct, depending on the nature of the rocket.

Question 8

A horse has a power output of 1 hp (746 W) when it is pulling a cart.If the cart covers 100 m in 30 s, the force the horse exerts on the cart is

Accepted Answer

A) 0.22 kN. 
B) 0.34 kN. 
C) 0.45 kN. 
D) 2.49 kN. 
A) 0.22 kN. 
B) 0.34 kN. 
C) 0.45 kN. 
D) 2.49 kN.

Question 9

A 90-kg llama has an average power output of 80 W.The minimum time the llama can go up a hill 500 m high is

Accepted Answer

A) 9.4 min. 
B) 46 min. 
C) 1.5 h. 
D) 9.2 h. 
A) 9.4 min. 
B) 46 min. 
C) 1.5 h. 
D) 9.2 h.

Question 10

When the speed of a moving object is halved,

Accepted Answer

A) its KE is halved. 
B) its PE is halved. 
C) its rest energy is halved. 
D) its momentum is halved. 
A) its KE is halved. 
B) its PE is halved. 
C) its rest energy is halved. 
D) its momentum is halved.

Question 11

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

Accepted Answer

A) 0.2 mm/s. 
B) 2 mm/s. 
C) 2 cm/s. 
D) 20 cm/s. 
A) 0.2 mm/s. 
B) 2 mm/s. 
C) 2 cm/s. 
D) 20 cm/s.

Question 12

A 1-N weight has a KE of 1 J when its speed is

Accepted Answer

A) 0.45 m/s. 
B) 1 m/s. 
C) 1.4 m/s. 
D) 4.4 m/s. 
A) 0.45 m/s. 
B) 1 m/s. 
C) 1.4 m/s. 
D) 4.4 m/s.

Question 13

The watt is a unit of

Accepted Answer

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

Question 14

An 800-kg car moving at 80 km/h collides head-on with a 1200-kg car moving at 40 km/h in the opposite direction.The total kinetic energy lost by the cars is

Accepted Answer

A) 0. 
B) less than that lost by the cars in question 48. 
C) the same as that lost by the cars in question 48. 
D) more than that lost by the cars in question 48. 
A) 0. 
B) less than that lost by the cars in question 48. 
C) the same as that lost by the cars in question 48. 
D) more than that lost by the cars in question 48.

Question 15

The speed of a 4000-kg truck whose KE is 1.8 MJ is

Accepted Answer

A) 0.95 m/s. 
B) 30 m/s. 
C) 94 m/s. 
D) 900 m/s. 
A) 0.95 m/s. 
B) 30 m/s. 
C) 94 m/s. 
D) 900 m/s.

Question 16

A horizontal force is applied to a 2-kg ball on a smooth table.The ball's speed is 8 m/s when it has gone 4 m.The magnitude of the force is

Accepted Answer

A) 1.6 N. 
B) 2 N. 
C) 8 N. 
D) 16 N. 
A) 1.6 N. 
B) 2 N. 
C) 8 N. 
D) 16 N.

Question 17

Which one or more of the following is a vector quantity?

Accepted Answer

A) linear momentum 
B) angular momentum 
C) kinetic energy 
D) potential energy 
E) Both A and B 
A) linear momentum 
B) angular momentum 
C) kinetic energy 
D) potential energy 
E) Both A and B

Question 18

The sun

Accepted Answer

A) attracts light waves passing nearby. 
B) repels light waves passing nearby. 
C) may attract or repel light waves passing nearby, depending upon the circumstances. 
D) has no effect on light waves passing nearby. 
A) attracts light waves passing nearby. 
B) repels light waves passing nearby. 
C) may attract or repel light waves passing nearby, depending upon the circumstances. 
D) has no effect on light waves passing nearby.

Question 19

The work you do in raising an orange from your waist to your mouth is roughly

Accepted Answer

A) 1 J. 
B) 10 J. 
C) 100 J. 
D) 1,000 J. 
A) 1 J. 
B) 10 J. 
C) 100 J. 
D) 1,000 J.

Question 20

The formula KE = ½mv2 for kinetic energy

Accepted Answer

A) is the correct formula if v is properly interpreted. 
B) always gives too high a value. 
C) is the low-speed approximation to the correct formula. 
D) is the high-speed approximation of the correct formula. 
A) is the correct formula if v is properly interpreted. 
B) always gives too high a value. 
C) is the low-speed approximation to the correct formula. 
D) is the high-speed approximation of the correct formula.

A 60-kg woman climbs a mountain 2000 m high in 10 h.Her average power output during the climb is

Rolling a ball up an inclined plank requires an amount of work proportional to the

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage has an initial speed of

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

A total of 4900 J is expended in lifting a 50-kg mass.The mass is raised to a height of

According to the general theory of relativity, gravitation

A rocket is fired in space.As it moves, the total momentum of the rocket and its exhaust gases

A horse has a power output of 1 hp (746 W) when it is pulling a cart.If the cart covers 100 m in 30 s, the force the horse exerts on the cart is

A 90-kg llama has an average power output of 80 W.The minimum time the llama can go up a hill 500 m high is

When the speed of a moving object is halved,

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

A 1-N weight has a KE of 1 J when its speed is

The watt is a unit of

An 800-kg car moving at 80 km/h collides head-on with a 1200-kg car moving at 40 km/h in the opposite direction.The total kinetic energy lost by the cars is

The speed of a 4000-kg truck whose KE is 1.8 MJ is

A horizontal force is applied to a 2-kg ball on a smooth table.The ball's speed is 8 m/s when it has gone 4 m.The magnitude of the force is

Which one or more of the following is a vector quantity?

The sun

The work you do in raising an orange from your waist to your mouth is roughly

The formula KE = ½mv² for kinetic energy

The Scientific Method

Motion

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

Universe

Filters

Exam 3: Energy

A 60-kg woman climbs a mountain 2000 m high in 10 h.Her average power output during the climb is

Rolling a ball up an inclined plank requires an amount of work proportional to the

An 800-kg car moving at 80 km/h overtakes a 1200-kg car moving at 40 km/h in the same direction.If the two cars stick together, the wreckage has an initial speed of

A 1-N weight has a PE relative to the ground of 1 J when it is at a height of

A total of 4900 J is expended in lifting a 50-kg mass.The mass is raised to a height of

According to the general theory of relativity, gravitation

A rocket is fired in space.As it moves, the total momentum of the rocket and its exhaust gases

A horse has a power output of 1 hp (746 W) when it is pulling a cart.If the cart covers 100 m in 30 s, the force the horse exerts on the cart is

A 90-kg llama has an average power output of 80 W.The minimum time the llama can go up a hill 500 m high is

When the speed of a moving object is halved,

A 100-kg astronaut ejects 4 g of gas from her propulsion pistol at a speed of 50 m/s.Her recoil speed is

A 1-N weight has a KE of 1 J when its speed is

The watt is a unit of

An 800-kg car moving at 80 km/h collides head-on with a 1200-kg car moving at 40 km/h in the opposite direction.The total kinetic energy lost by the cars is

The speed of a 4000-kg truck whose KE is 1.8 MJ is

A horizontal force is applied to a 2-kg ball on a smooth table.The ball's speed is 8 m/s when it has gone 4 m.The magnitude of the force is

Which one or more of the following is a vector quantity?

The sun

The work you do in raising an orange from your waist to your mouth is roughly

The formula KE = ½mv2 for kinetic energy

The Scientific Method

Motion

Energy and the Future

Matter and Heat

Electricity and Magnetism

Waves

The Nucleus

The Atom

The Periodic Law

Crystals, Ions, and Solutions

Chemical Reactions

Organic Chemistry

Atmosphere and Hydrosphere

The Rock Cycle

The Evolving Earth

The Solar System

The Stars

Universe

Filters

The formula KE = ½mv² for kinetic energy