Question 1

What is one "kilowatt- hour" [kW · h]?

Accepted Answer

A)  It is the force output of one kilowatt operating for one hour. 
B)  It is the power output of a one kilowatt device. 
C)  It is work done continuously for one hour. 
D)  It is the energy output of one kilowatt operating for one hour. 
E)  Actually, nobody knows what this term means. 
A)  It is the force output of one kilowatt operating for one hour. 
B)  It is the power output of a one kilowatt device. 
C)  It is work done continuously for one hour. 
D)  It is the energy output of one kilowatt operating for one hour. 
E)  Actually, nobody knows what this term means. D

Question 2

What physical quantity is measured in "watts"?

Accepted Answer

A)  power 
B)  electric current 
C)  energy 
D)  force 
E)  voltage 
A)  power 
B)  electric current 
C)  energy 
D)  force 
E)  voltage A

Question 3

The energy conversion represented by an automobile speeding up along a level road is

Accepted Answer

A)  chemical to kinetic. 
B)  chemical to gravitational. 
C)  gravitational to kinetic. 
D)  kinetic to chemical. 
E)  thermal to chemical. 
A)  chemical to kinetic. 
B)  chemical to gravitational. 
C)  gravitational to kinetic. 
D)  kinetic to chemical. 
E)  thermal to chemical. A

Question 4

Which one of our 8 standard physical forms of energy is present in gasoline?

Accepted Answer

A)  thermal 
B)  chemical 
C)  kinetic 
D)  radiant 
E)  solar 
A)  thermal 
B)  chemical 
C)  kinetic 
D)  radiant 
E)  solar

Question 5

A 2000 N car travels 50 m along a level road, powered by a drive force of 1000 N. The work done by the drive force is

Accepted Answer

A)  1000 J. 
B)  2000 J. 
C)  50,000 J. 
D)  10,000 J. 
E)  zero. 
A)  1000 J. 
B)  2000 J. 
C)  50,000 J. 
D)  10,000 J. 
E)  zero.

Question 6

The figure above shows a marble rolling freely back and forth along a curved track. The track is positioned vertically. Assuming no friction and no air resistance, the total energy of the marble

Accepted Answer

A)  decreases when the marble rolls from A to B. 
B)  increases when the marble rolls from A to B. 
C)  remains the same when the marble rolls from A to B. 
A)  decreases when the marble rolls from A to B. 
B)  increases when the marble rolls from A to B. 
C)  remains the same when the marble rolls from A to B.

Question 7

What form(s) of energy does the falling rubber ball have when it is halfway down (see figure)?

Accepted Answer

A)  Gravitational only 
B)  Kinetic and gravitational and elastic 
C)  Kinetic only 
D)  Elastic only 
E)  Kinetic and gravitational 
A)  Gravitational only 
B)  Kinetic and gravitational and elastic 
C)  Kinetic only 
D)  Elastic only 
E)  Kinetic and gravitational

Question 8

You throw a baseball horizontally, and Jill catches it. Neglect air resistance. The energy transformation that occurs during the catch is

Accepted Answer

A)  thermal E ·kinetic E. 
B)  chemical E ·gravitational E. 
C)  kinetic E ·thermal E. 
D)  kinetic E ·chemical E. 
E)  chemical E ·kinetic E. 
A)  thermal E ·kinetic E. 
B)  chemical E ·gravitational E. 
C)  kinetic E ·thermal E. 
D)  kinetic E ·chemical E. 
E)  chemical E ·kinetic E.

Question 9

The main energy transformation that occurs while an electric blender is mixing your orange juice is

Accepted Answer

A)  chemical E ·thermal E. 
B)  electric E ·kinetic E. 
C)  thermal E ·kinetic E. 
D)  kinetic E ·electric E. 
E)  electric E ·chemical E. 
A)  chemical E ·thermal E. 
B)  electric E ·kinetic E. 
C)  thermal E ·kinetic E. 
D)  kinetic E ·electric E. 
E)  electric E ·chemical E.

Question 10

Thousands of years ago, after humans began settling in villages, their settlements were energized by

Accepted Answer

A)  radiant energy. 
B)  gravitational energy. 
C)  chemical energy. 
D)  nuclear energy. 
E)  thermal energy. 
A)  radiant energy. 
B)  gravitational energy. 
C)  chemical energy. 
D)  nuclear energy. 
E)  thermal energy.

Question 11

"Time- of- day" pricing of electricity could help to

Accepted Answer

A)  reduce total electric energy use by encouraging users to use less electric energy. 
B)  reduce the need for new power plants by encouraging users to use electric energy at less popular times. 
C)  reduce total electric energy use by encouraging users to use electric energy at less popular times. 
D)  reduce the nation's appetite for chocolate fudge. 
E)  reduce the need for new power plants by encouraging users to use less electric energy. 
A)  reduce total electric energy use by encouraging users to use less electric energy. 
B)  reduce the need for new power plants by encouraging users to use electric energy at less popular times. 
C)  reduce total electric energy use by encouraging users to use electric energy at less popular times. 
D)  reduce the nation's appetite for chocolate fudge. 
E)  reduce the need for new power plants by encouraging users to use less electric energy.

Question 12

Suppose you slowly, and at constant speed, lift a book weighing 12 N from the floor to a shelf 2 m above the floor. Neglect air resistance. The work done by you on the book is

Accepted Answer

A)  zero. 
B)  6 joules. 
C)  24 watts. 
D)  6 watts. 
E)  24 joules. 
A)  zero. 
B)  6 joules. 
C)  24 watts. 
D)  6 watts. 
E)  24 joules.

Question 13

A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy- efficient is this bulb [as a producer of light]?

Accepted Answer

A)  80% 
B)  500% 
C)  20% 
D)  400% 
E)  25% 
A)  80% 
B)  500% 
C)  20% 
D)  400% 
E)  25%

Question 14

What energy transformation occurs during photosynthesis?

Accepted Answer

A)  chemical E ·kinetic E 
B)  radiant E ·kinetic E 
C)  thermal E ·chemical E 
D)  chemical E ·thermal E 
E)  radiant E ·chemical E 
A)  chemical E ·kinetic E 
B)  radiant E ·kinetic E 
C)  thermal E ·chemical E 
D)  chemical E ·thermal E 
E)  radiant E ·chemical E

Question 15

You run a 5000 watt clothes- dryer for 2 hours. How many kilowatt- hours of energy did you consume?

Accepted Answer

A)  0.4 
B)  10 
C)  2.5 
D)  2500 
E)  Cannot be determined from the given information 
A)  0.4 
B)  10 
C)  2.5 
D)  2500 
E)  Cannot be determined from the given information

Question 16

The power of American automobiles is usually rated in "horsepower." What other units could be used?

Accepted Answer

A)  watts 
B)  joules 
C)  Calories 
D)  None of the above. 
E)  All of the above. 
A)  watts 
B)  joules 
C)  Calories 
D)  None of the above. 
E)  All of the above.

Question 17

Elizabeth lifts a 10 N book from the floor to the table, a height of 2 m. How much work does Elizabeth do?

Accepted Answer

A)  5 joules 
B)  5 watts 
C)  20 watts 
D)  20 joules 
E)  Elizabeth does zero work 
A)  5 joules 
B)  5 watts 
C)  20 watts 
D)  20 joules 
E)  Elizabeth does zero work

Question 18

A certain meteoroid [a rock in space] has been moving through our solar system ever since the solar system was formed, 5 billion years ago. Suppose the meteoroid is far from all planets and stars, so that the effect of gravity is negligible. Neglecting gravity, is any physical work being done on the meteoroid?

Accepted Answer

A)  Yes, because the force of inertia is exerted on the meteoroid while the meteoroid moves. 
B)  No, because the force of inertia on the meteoroid is balanced by the equal reaction force by the meteroid. 
C)  Yes, because the meteoroid is moving. 
D)  Yes, because work is always required to move any massive object through a distance. 
E)  No, because no forces are exerted on the meteoroid. 
A)  Yes, because the force of inertia is exerted on the meteoroid while the meteoroid moves. 
B)  No, because the force of inertia on the meteoroid is balanced by the equal reaction force by the meteroid. 
C)  Yes, because the meteoroid is moving. 
D)  Yes, because work is always required to move any massive object through a distance. 
E)  No, because no forces are exerted on the meteoroid.

Question 19

James Prescott Joule's experiments, such as stirring a container full of liquid, showed that

Accepted Answer

A)  Mr. Joule did not know how to make a good batch of chili. 
B)  thermal energy is actually a form of energy. 
C)  all forms of energy are conserved. 
D)  the "Newtonian" energy forms [kinetic, gravitational, elastic] are conserved. 
E)  radiant energy is actually a form of energy. 
A)  Mr. Joule did not know how to make a good batch of chili. 
B)  thermal energy is actually a form of energy. 
C)  all forms of energy are conserved. 
D)  the "Newtonian" energy forms [kinetic, gravitational, elastic] are conserved. 
E)  radiant energy is actually a form of energy.

Question 20

You push your physics book across a table. The book weighs 8 N, you push with a steady 5 N force, and the force of friction against the book is 3 N. You push the book a distance of 2 m. The amount of work you do on the book is

Accepted Answer

A)  6 J. 
B)  10 J. 
C)  zero. 
D)  16 J. 
E)  impossible to tell without more information. 
A)  6 J. 
B)  10 J. 
C)  zero. 
D)  16 J. 
E)  impossible to tell without more information.

What is one "kilowatt- hour" [kW · h]?

What physical quantity is measured in "watts"?

The energy conversion represented by an automobile speeding up along a level road is

Which one of our 8 standard physical forms of energy is present in gasoline?

A 2000 N car travels 50 m along a level road, powered by a drive force of 1000 N. The work done by the drive force is

The figure above shows a marble rolling freely back and forth along a curved track. The track is positioned vertically. Assuming no friction and no air resistance, the total energy of the marble

What form(s) of energy does the falling rubber ball have when it is halfway down (see figure)?

You throw a baseball horizontally, and Jill catches it. Neglect air resistance. The energy transformation that occurs during the catch is

The main energy transformation that occurs while an electric blender is mixing your orange juice is

Thousands of years ago, after humans began settling in villages, their settlements were energized by

"Time- of- day" pricing of electricity could help to

Suppose you slowly, and at constant speed, lift a book weighing 12 N from the floor to a shelf 2 m above the floor. Neglect air resistance. The work done by you on the book is

A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy- efficient is this bulb [as a producer of light]?

What energy transformation occurs during photosynthesis?

You run a 5000 watt clothes- dryer for 2 hours. How many kilowatt- hours of energy did you consume?

The power of American automobiles is usually rated in "horsepower." What other units could be used?

Elizabeth lifts a 10 N book from the floor to the table, a height of 2 m. How much work does Elizabeth do?

James Prescott Joule's experiments, such as stirring a container full of liquid, showed that

You push your physics book across a table. The book weighs 8 N, you push with a steady 5 N force, and the force of friction against the book is 3 N. You push the book a distance of 2 m. The amount of work you do on the book is

The Way of Science: Experience and Reason

Atoms: the Nature of Things

How Things Move: Galileo Asks the Right Questions

Why Things Move As They Do

Newtons Universe

Second Law of Thermodynamics: and You Cant Even Break Even

Light and Electromagnetism

Electromagnetism Radiation and Global Climate Change

The Special Theory of Relativity

The General Theory of Relativity and the New Cosmology

The Quantum Idea

The Quantum Universe

The Nucleus and Radioactivity: an New Force

Fusion and Fission: and a New Energy

The Energy Challenge

Quantum Fields: Relativity Meets the Quantum

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Exam 6: Conservation of Energy: You Cant Get Ahead

What is one "kilowatt- hour" [kW · h]?

What physical quantity is measured in "watts"?

The energy conversion represented by an automobile speeding up along a level road is

Which one of our 8 standard physical forms of energy is present in gasoline?

A 2000 N car travels 50 m along a level road, powered by a drive force of 1000 N. The work done by the drive force is

The figure above shows a marble rolling freely back and forth along a curved track. The track is positioned vertically. Assuming no friction and no air resistance, the total energy of the marble

What form(s) of energy does the falling rubber ball have when it is halfway down (see figure)?

You throw a baseball horizontally, and Jill catches it. Neglect air resistance. The energy transformation that occurs during the catch is

The main energy transformation that occurs while an electric blender is mixing your orange juice is

Thousands of years ago, after humans began settling in villages, their settlements were energized by

"Time- of- day" pricing of electricity could help to

Suppose you slowly, and at constant speed, lift a book weighing 12 N from the floor to a shelf 2 m above the floor. Neglect air resistance. The work done by you on the book is

A particular lightbulb produces 8 J of thermal energy while producing 2 J of radiant energy, and this is its entire energy output during this time. How energy- efficient is this bulb [as a producer of light]?

What energy transformation occurs during photosynthesis?

You run a 5000 watt clothes- dryer for 2 hours. How many kilowatt- hours of energy did you consume?

The power of American automobiles is usually rated in "horsepower." What other units could be used?

Elizabeth lifts a 10 N book from the floor to the table, a height of 2 m. How much work does Elizabeth do?

James Prescott Joule's experiments, such as stirring a container full of liquid, showed that

You push your physics book across a table. The book weighs 8 N, you push with a steady 5 N force, and the force of friction against the book is 3 N. You push the book a distance of 2 m. The amount of work you do on the book is

The Way of Science: Experience and Reason

Atoms: the Nature of Things

How Things Move: Galileo Asks the Right Questions

Why Things Move As They Do

Newtons Universe

Second Law of Thermodynamics: and You Cant Even Break Even

Light and Electromagnetism

Electromagnetism Radiation and Global Climate Change

The Special Theory of Relativity

The General Theory of Relativity and the New Cosmology

The Quantum Idea

The Quantum Universe

The Nucleus and Radioactivity: an New Force

Fusion and Fission: and a New Energy

The Energy Challenge

Quantum Fields: Relativity Meets the Quantum

Filters