Question 1

Solar power is commonly used to produce

Accepted Answer

A) heat. 
B) electricity. 
C) both of these 
A) heat. 
B) electricity. 
C) both of these C

Question 2

Which requires the most amount of work by the brakes of a car?

Accepted Answer

A) slowing down from 100 km/h to 70 km/h 
B) slowing down from 70 km/h to a stop 
C) equal amounts for both 
A) slowing down from 100 km/h to 70 km/h 
B) slowing down from 70 km/h to a stop 
C) equal amounts for both A

Question 3

A block of ice sliding down an incline has half its maximum kinetic energy

Accepted Answer

A) at the top. 
B) at the bottom. 
C) halfway down. 
D) need more information 
A) at the top. 
B) at the bottom. 
C) halfway down. 
D) need more information C

Question 4

After rolling halfway 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 5

Hydrogen, like electricity, is

Accepted Answer

A) an energy source. 
B) not an energy source. 
C) a source of both thermal and electric power. 
A) an energy source. 
B) not an energy source. 
C) a source of both thermal and electric power.

Question 6

When you and your snowboard are in motion, which of the following can be zero?

Accepted Answer

A) momentum 
B) kinetic energy 
C) mass 
D) inertia 
E) none of the above 
A) momentum 
B) kinetic energy 
C) mass 
D) inertia 
E) none of the above

Question 7

A hydraulic press has its input piston depressed 20 centimeters while the output piston is raised 1 centimeter. A 1-newton input can lift a load of

Accepted Answer

A) 1 N. 
B) 10 N. 
C) 15 N. 
D) 20 N. 
E) none of the above 
A) 1 N. 
B) 10 N. 
C) 15 N. 
D) 20 N. 
E) none of the above

Question 8

Hydro and wind power are indirect forms of

Accepted Answer

A) solar energy. 
B) fossil fuels deep down. 
C) nuclear energy in Earth's interior. 
D) none of the above 
A) solar energy. 
B) fossil fuels deep down. 
C) nuclear energy in Earth's interior. 
D) none of the above

Question 9

The most concentrated form of energy is

Accepted Answer

A) wind. 
B) fossil fuel. 
C) geothermal. 
D) nuclear. 
A) wind. 
B) fossil fuel. 
C) geothermal. 
D) nuclear.

Question 10

When a cannon is fired, it recoils as the cannonball is set in motion. The cannon and cannonball ideally acquire equal

Accepted Answer

A) but opposite amounts of momentum. 
B) amounts of kinetic energy. 
C) both of these 
D) neither of these 
A) but opposite amounts of momentum. 
B) amounts of kinetic energy. 
C) both of these 
D) neither of these

Question 11

If you do work on a skateboard loaded with friends in one-third the usual time, you expend

Accepted Answer

A) one third as much power. 
B) the usual power. 
C) three times the usual power. 
D) need more information. 
A) one third as much power. 
B) the usual power. 
C) three times the usual power. 
D) need more information.

Question 12

A 2-kg box of taffy candy has 40 J of potential energy relative to the ground. Its height above the ground is

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 13

A circus diver drops from a high pole into water far below. When he is halfway down

Accepted Answer

A) his potential energy is halved. 
B) he has gained an amount of kinetic energy equal to half his initial potential energy. 
C) his kinetic energy and potential energy are equal. 
D) all of the above 
E) none of the above 
A) his potential energy is halved. 
B) he has gained an amount of kinetic energy equal to half his initial potential energy. 
C) his kinetic energy and potential energy are equal. 
D) all of the above 
E) none of the above

Question 14

The amount of work done on a heavy box carried by Nellie across a room at a constant speed

Accepted Answer

A) depends on the weight of the box. 
B) depends on the distance walked. 
C) depends on both weight of the box and distance walked. 
D) is none. 
E) none of the above 
A) depends on the weight of the box. 
B) depends on the distance walked. 
C) depends on both weight of the box and distance walked. 
D) is none. 
E) none of the above

Question 15

Acrobat Bart at the circus drops vertically onto the end of a see-saw, with his partner Art equidistant from the fulcrum at the other end. Art is propelled straight upward a distance twice that of Bart's dropping distance. Neglecting inefficiencies we see

Accepted Answer

A) the masses of Art and Bart are equal. 
B) Art has half the mass of Bart. 
C) need more information 
A) the masses of Art and Bart are equal. 
B) Art has half the mass of Bart. 
C) need more information

Question 16

The bob of a simple pendulum has its maximum kinetic energy at the

Accepted Answer

A) top of its swing. 
B) bottom of its swing. 
C) midpoint between top and bottom. 
D) at all points along its path of swing. 
A) top of its swing. 
B) bottom of its swing. 
C) midpoint between top and bottom. 
D) at all points along its path of swing.

Question 17

Two 2-m/s pool balls roll toward each other and collide. Suppose after bouncing apart each moves at 4 m/s. This collision violates the conservation of

Accepted Answer

A) momentum. 
B) energy. 
C) both momentum and energy. 
D) none of the above 
A) momentum. 
B) energy. 
C) both momentum and energy. 
D) none of the above

Question 18

Newton's Cradle consists of an aligned row of identical elastic balls suspended by strings so they barely touch one another. When two balls are raised from one end and released, they strike the row and two balls pop out from the other end. If instead, one ball popped out with twice the speed of the two, this would violate

Accepted Answer

A) momentum conservation. 
B) energy conservation. 
C) both of these 
D) none of these 
A) momentum conservation. 
B) energy conservation. 
C) both of these 
D) none of these

Question 19

Neglecting air resistance, Sammy Smarts on a high ladder releases a ball that strikes the ground with 100 J of kinetic energy. If he were to instead throw the ball straight upward, it will soon reach the ground with a kinetic energy of

Accepted Answer

A) less than 100 J. 
B) 100 J. 
C) more than 100 J. 
A) less than 100 J. 
B) 100 J. 
C) more than 100 J.

Question 20

Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of

Accepted Answer

A) 10 J. 
B) 500 J. 
C) 510 J. 
D) 5000 J. 
E) more than 5000 J. 
A) 10 J. 
B) 500 J. 
C) 510 J. 
D) 5000 J. 
E) more than 5000 J.

Exam 7: Energy

Solar power is commonly used to produce

Which requires the most amount of work by the brakes of a car?

A block of ice sliding down an incline has half its maximum kinetic energy

After rolling halfway down an incline, a marble's kinetic energy is

Hydrogen, like electricity, is

When you and your snowboard are in motion, which of the following can be zero?

A hydraulic press has its input piston depressed 20 centimeters while the output piston is raised 1 centimeter. A 1-newton input can lift a load of

Hydro and wind power are indirect forms of

The most concentrated form of energy is

When a cannon is fired, it recoils as the cannonball is set in motion. The cannon and cannonball ideally acquire equal

If you do work on a skateboard loaded with friends in one-third the usual time, you expend

A 2-kg box of taffy candy has 40 J of potential energy relative to the ground. Its height above the ground is

A circus diver drops from a high pole into water far below. When he is halfway down

The amount of work done on a heavy box carried by Nellie across a room at a constant speed

Acrobat Bart at the circus drops vertically onto the end of a see-saw, with his partner Art equidistant from the fulcrum at the other end. Art is propelled straight upward a distance twice that of Bart's dropping distance. Neglecting inefficiencies we see

The bob of a simple pendulum has its maximum kinetic energy at the

Two 2-m/s pool balls roll toward each other and collide. Suppose after bouncing apart each moves at 4 m/s. This collision violates the conservation of

Neglecting air resistance, Sammy Smarts on a high ladder releases a ball that strikes the ground with 100 J of kinetic energy. If he were to instead throw the ball straight upward, it will soon reach the ground with a kinetic energy of

Danny Diver weighs 500 N and steps off a diving board 10 m above the water. Danny hits the water with kinetic energy of

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