Question 1

One watt is equal to one joule per ______________.

Accepted Answer

A)  second 
B)  newton 
C)  hour 
D)  kilogram 
A)  second 
B)  newton 
C)  hour 
D)  kilogram A

Question 2

Work in the amount of 280 J is done in lifting an object a distance of 4.0 m in a time of 7.0 s.
a. How much force did it take to lift the object?
b. What was the power input?

Accepted Answer

a.70 N b.40 W​

Question 3

The product of one ______________ and one meter is one joule.

Accepted Answer

newton

Question 4

The bob of a simple pendulum is 0.50 m above the floor at its lowest position.Calculate the maximum speed of the bob when it is held at a maximum height of 2.5 m and released.
​

Accepted Answer

The answer of The bob of a simple pendulum is...

Question 5

The ______________ distance is used in calculating work.

Accepted Answer

A)  normal 
B)  square of 
C)  perpendicular 
D)  parallel 
A)  normal 
B)  square of 
C)  perpendicular 
D)  parallel

Question 6

A 5.0-kg object is lifted 1.1 m from the floor to a table.What is the object's gravitational potential energy relative to the floor?

Accepted Answer

The answer of A 5.0-kg object is lifted 1.1 m...

Question 7

A system may

Accepted Answer

A)  be isolated. 
B)  have real boundaries. 
C)  have imaginary boundaries. 
D)  all of these 
A)  be isolated. 
B)  have real boundaries. 
C)  have imaginary boundaries. 
D)  all of these

Question 8

Some food costs may rise in the future as a consequence of the increased use of which food-based fuel?

Accepted Answer

A)  Ethanol 
B)  Gasoline 
C)  Oil 
D)  Coal 
A)  Ethanol 
B)  Gasoline 
C)  Oil 
D)  Coal

Question 9

Mechanical energy

Accepted Answer

A)  is always the total energy of a system. 
B)  is the sum of the energies of motion and position. 
C)  is always conserved. 
D)  necessarily involves gravitational potential energy. 
A)  is always the total energy of a system. 
B)  is the sum of the energies of motion and position. 
C)  is always conserved. 
D)  necessarily involves gravitational potential energy.

Question 10

A watt is one ______________ per second.

Accepted Answer

The answer of A watt is one ______________ per second....

Question 11

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.

Question 12

Besides fossil fuels,the only other significant commercial sources of energy are ______________ and ______________.

Accepted Answer

The answer of Besides fossil fuels,the only other significant commercial...

Question 13

A system for which there are no outside effects is said to be ______________.

Accepted Answer

The answer of A system for which there are no...

Question 14

An object has kinetic energy of 324 J.If its speed is 9 m/s,what is its mass?

Accepted Answer

A)  8 
B)  36 
C)  1620 
D)  324 
A)  8 
B)  36 
C)  1620 
D)  324

Question 15

A force of 12 N acts on a 2.0-kg object through a parallel distance of 1.5 m.How much work is done on the object?

Accepted Answer

The answer of A force of 12 N acts on...

Question 16

Which of the following is not a unit of power?

Accepted Answer

A)  ft · lb/s 
B)  N · m 
C)  J/s 
D)  watt 
A)  ft · lb/s 
B)  N · m 
C)  J/s 
D)  watt

Question 17

One positive aspect of the potential use of methane hydrate as a fuel is that

Accepted Answer

A)  there is more of it than there is of coal, oil, and natural gas. 
B)  it is easy to mine. 
C)  its use will never contribute to global warming. 
D)  it exists in a pure form ready for use. 
A)  there is more of it than there is of coal, oil, and natural gas. 
B)  it is easy to mine. 
C)  its use will never contribute to global warming. 
D)  it exists in a pure form ready for use.

Question 18

With a constant braking force,the stopping distance of a car is proportional to ______________.

Accepted Answer

the square

Question 19

Which of the following four objects has the greatest 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.

Question 20

What is bought from an electric company?

Accepted Answer

A)  Electrical energy 
B)  Electric charge 
C)  Electrical power 
D)  None of these 
A)  Electrical energy 
B)  Electric charge 
C)  Electrical power 
D)  None of these

Exam 4: Work and Energy

One watt is equal to one joule per ______________.

Work in the amount of 280 J is done in lifting an object a distance of 4.0 m in a time of 7.0 s. a. How much force did it take to lift the object? b. What was the power input?

The product of one ______________ and one meter is one joule.

The bob of a simple pendulum is 0.50 m above the floor at its lowest position.Calculate the maximum speed of the bob when it is held at a maximum height of 2.5 m and released. ​

The ______________ distance is used in calculating work.

A 5.0-kg object is lifted 1.1 m from the floor to a table.What is the object's gravitational potential energy relative to the floor?

A system may

Some food costs may rise in the future as a consequence of the increased use of which food-based fuel?

Mechanical energy

A watt is one ______________ per second.

The energy of a system

Besides fossil fuels,the only other significant commercial sources of energy are ______________ and ______________.

A system for which there are no outside effects is said to be ______________.

An object has kinetic energy of 324 J.If its speed is 9 m/s,what is its mass?

A force of 12 N acts on a 2.0-kg object through a parallel distance of 1.5 m.How much work is done on the object?

Which of the following is not a unit of power?

One positive aspect of the potential use of methane hydrate as a fuel is that

With a constant braking force,the stopping distance of a car is proportional to ______________.

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

What is bought from an electric company?

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

Filters

The bob of a simple pendulum is 0.50 m above the floor at its lowest position.Calculate the maximum speed of the bob when it is held at a maximum height of 2.5 m and released.

Besides fossil fuels,the only other significant commercial sources of energy are and .