Question 1

Which of the following four objects has the least kinetic energy?

Accepted Answer

A)  An object of mass m moving with speed 4v 
B)  An object of mass 3m moving with speed 2v 
C)  An object of mass 4m moving with speed v 
D)  An object of mass 2m moving with speed 3v 
E)  None of these; all four objects have the same kinetic energy. 
A)  An object of mass m moving with speed 4v 
B)  An object of mass 3m moving with speed 2v 
C)  An object of mass 4m moving with speed v 
D)  An object of mass 2m moving with speed 3v 
E)  None of these; all four objects have the same kinetic energy. C

Question 2

Which of the following is not a scalar quantity?

Accepted Answer

A)  Kinetic energy 
B)  Potential energy 
C)  Power 
D)  Work 
E)  None of these; that is, they are all scalar quantities. 
A)  Kinetic energy 
B)  Potential energy 
C)  Power 
D)  Work 
E)  None of these; that is, they are all scalar quantities. E

Question 3

The energy of a system

Accepted Answer

A)  always increases. 
B)  always remains constant. 
C)  decreases when work is done by the system. 
D)  decreases when work is done on the system. 
A)  always increases. 
B)  always remains constant. 
C)  decreases when work is done by the system. 
D)  decreases when work is done on the system. C

Question 4

"Ice that burns" is better known as

Accepted Answer

A)  propane. 
B)  frozen oil. 
C)  coal. 
D)  methane hydrate. 
A)  propane. 
B)  frozen oil. 
C)  coal. 
D)  methane hydrate.

Question 5

Energy resulting from motion is called ______________.

Accepted Answer

The answer of Energy resulting from motion is called ______________....

Question 6

Energy sources that would be nonpolluting supplements to our energy are called ______________ fuels.

Accepted Answer

The answer of Energy sources that would be nonpolluting supplements...

Question 7

A 2-hp motor can do the same amount of work as a 1-hp motor in ______________ the time.
n

Accepted Answer

The answer of A 2-hp motor can do the same...

Question 8

Which of the following is a vector quantity?

Accepted Answer

A)  Force 
B)  Power 
C)  Work 
D)  Time 
E)  None of these 
A)  Force 
B)  Power 
C)  Work 
D)  Time 
E)  None of these

Question 9

A 4-kg object falls vertically a distance of 5 m. Its potential energy has changed by approximately how much?

Accepted Answer

A)  It has increased by 20 J. 
B)  It has decreased by 200 J. 
C)  It has decreased by 20 J. 
D)  It has increased by 200 J. 
A)  It has increased by 20 J. 
B)  It has decreased by 200 J. 
C)  It has decreased by 20 J. 
D)  It has increased by 200 J.

Question 10

Work requires

Accepted Answer

A)  motion. 
B)  zero net force. 
C)  zero momentum. 
D)  a force perpendicular to the direction of motion. 
A)  motion. 
B)  zero net force. 
C)  zero momentum. 
D)  a force perpendicular to the direction of motion.

Question 11

Gravitational potential energy is equal to the ______________ of an object times its height.

Accepted Answer

weight, or

Question 12

A student weighing 700 N climbs a flight of stairs 5.0 m high in 10 s. What power was required?

Accepted Answer

​3.5 * 10<

Question 13

The quantity   is known as

Accepted Answer

A)  kinetic energy. 
B)  potential energy. 
C)  work. 
D)  energy. 
E)  power. 
A)  kinetic energy. 
B)  potential energy. 
C)  work. 
D)  energy. 
E)  power.

Question 14

When a 6-kg object increases its potential energy by 180 J, approximately how has its position changed?

Accepted Answer

A)  It has risen vertically 3 m. 
B)  It has fallen vertically 3 m. 
C)  It has risen vertically 30 m. 
D)  It has moved horizontally 30 m. 
A)  It has risen vertically 3 m. 
B)  It has fallen vertically 3 m. 
C)  It has risen vertically 30 m. 
D)  It has moved horizontally 30 m.

Question 15

According to the law of conservation of energy, energy cannot be ______________ or ______________.

Accepted Answer

The answer of According to the law of conservation of...

Question 16

A student weighing 700 N climbs a flight of stairs 5.0 m high. Calculate the work done.

Accepted Answer

The answer of A student weighing 700 N climbs a...

Question 17

Mechanical energy

Accepted Answer

A)  is the automobile energy. 
B)  is the sum of kinetic and potential energies. 
C)  is the kinetic energy. 
D)  is the potential energy. 
A)  is the automobile energy. 
B)  is the sum of kinetic and potential energies. 
C)  is the kinetic energy. 
D)  is the potential energy.

Question 18

Kinetic and potential energies are forms of ______________ energy.

Accepted Answer

The answer of Kinetic and potential energies are forms of...

Question 19

A joule/meter (J/m) is a unit of

Accepted Answer

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

Question 20

The kinetic energy of a pendulum is least

Accepted Answer

A)  when its potential energy is least. 
B)  at the top of its swing. 
C)  at the bottom of its swing. 
D)  when its total energy is greatest. 
A)  when its potential energy is least. 
B)  at the top of its swing. 
C)  at the bottom of its swing. 
D)  when its total energy is greatest.

Exam 4: Work and Energy

Which of the following four objects has the least kinetic energy?

Which of the following is not a scalar quantity?

The energy of a system

"Ice that burns" is better known as

Energy resulting from motion is called ______________.

Energy sources that would be nonpolluting supplements to our energy are called ______________ fuels.

A 2-hp motor can do the same amount of work as a 1-hp motor in ______________ the time. n

Which of the following is a vector quantity?

A 4-kg object falls vertically a distance of 5 m. Its potential energy has changed by approximately how much?

Work requires

Gravitational potential energy is equal to the ______________ of an object times its height.

A student weighing 700 N climbs a flight of stairs 5.0 m high in 10 s. What power was required?

The quantity is known as

When a 6-kg object increases its potential energy by 180 J, approximately how has its position changed?

According to the law of conservation of energy, energy cannot be ______________ or ______________.

A student weighing 700 N climbs a flight of stairs 5.0 m high. Calculate the work done.

Mechanical energy

Kinetic and potential energies are forms of ______________ energy.

A joule/meter (J/m) is a unit of

The kinetic energy of a pendulum is least

Measurement

Motion

Force and Motion

Temperature and Heat

Waves and Sound

Optics and Wave Effects

Electricity and Magnetism

Atomic Physics

Nuclear Physics

The Chemical Elements

Chemical Bonding

Chemical Reactions

Organic Chemistry

Place and Time

The Solar System

Moons and Small Solar System Bodies

The Universe

The Atmosphere

Atmospheric Effects

Structural G Eology and P Late Tectonics

Minerals, Rocks, and Volcanoes

Surface Processes

Geologic Time

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According to the law of conservation of energy, energy cannot be or .