Question 1

The SI unit of power is the ______________.

Accepted Answer

The answer of The SI unit of power is the...

Question 2

Work is defined as force times

Accepted Answer

A)  distance. 
B)  time. 
C)  parallel distance. 
D)  perpendicular distance. 
A)  distance. 
B)  time. 
C)  parallel distance. 
D)  perpendicular distance.

Question 3

In lifting an object, work is done against ______________.

Accepted Answer

The answer of In lifting an object, work is done...

Question 4

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 5

A 1000-kg car traveling at 70 m/s takes 3 m to stop under full braking. The same car under similar road conditions, traveling at 140 m/s, takes ______________ m to stop under full braking.

Accepted Answer

A)  6 
B)  1 
C)  3 
D)  12 
E)  11 
A)  6 
B)  1 
C)  3 
D)  12 
E)  11

Question 6

Work is the process by which energy is ______________.

Accepted Answer

The answer of Work is the process by which energy...

Question 7

The potential energy of a pendulum is least

Accepted Answer

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

Question 8

For which of the following reasons is production of ethanol unwise?

Accepted Answer

A)  Pollutants aren't significantly reduced. 
B)  It takes twice as much fossil-fuel energy to produce ethanol than the ethanol that is produced supplies. 
C)  It can drive costs of corn higher. 
D)  All of the above. 
A)  Pollutants aren't significantly reduced. 
B)  It takes twice as much fossil-fuel energy to produce ethanol than the ethanol that is produced supplies. 
C)  It can drive costs of corn higher. 
D)  All of the above.

Question 9

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 10

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 11

Energy provided directly from Earth's interior is called

Accepted Answer

A)  groundwater energy. 
B)  geothermal energy. 
C)  artesian energy. 
D)  thermionic energy. 
A)  groundwater energy. 
B)  geothermal energy. 
C)  artesian energy. 
D)  thermionic energy.

Question 12

Power is

Accepted Answer

A)  work divided by time. 
B)  velocity multiplied by time. 
C)  momentum divided by time. 
D)  energy multiplied by time. 
A)  work divided by time. 
B)  velocity multiplied by time. 
C)  momentum divided by time. 
D)  energy multiplied by time.

Question 13

Which of the following is(are) drawbacks to the use of methane hydrate as a fuel?

Accepted Answer

A)  When melted, it produces methane, a greenhouse gas. 
B)  It is difficult to mine as a solid located at the bottom of the oceans. 
C)  It is mixed with water. 
D)  All of these are drawbacks associated with methane hydrate. 
A)  When melted, it produces methane, a greenhouse gas. 
B)  It is difficult to mine as a solid located at the bottom of the oceans. 
C)  It is mixed with water. 
D)  All of these are drawbacks associated with methane hydrate.

Question 14

A force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m. How much work is done on the object?

Accepted Answer

The answer of A force of 7.2 N acting on...

Question 15

A 5.00-kg object is lifted from the floor to a shelf. The object's new gravitational potential energy relative to the floor is 102 J. What is the height of the shelf?

Accepted Answer

The answer of A 5.00-kg object is lifted from the...

Question 16

Given 10 kWh of electricity and assuming no losses, how much work, in joules, could be done?

Accepted Answer

3.6 * 10<s

Question 17

The energy of motion is called

Accepted Answer

A)  inertia. 
B)  power. 
C)  kinetic energy. 
D)  potential energy. 
A)  inertia. 
B)  power. 
C)  kinetic energy. 
D)  potential energy.

Question 18

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...

Question 19

A student weighing 300 N climbed a flight of stairs 5.0 m high in 6 s. How much work was done by the student?

Accepted Answer

A)  1500 J 
B)  1800 J 
C)  1500 W 
D)  1800 W 
E)  50 W 
A)  1500 J 
B)  1800 J 
C)  1500 W 
D)  1800 W 
E)  50 W

Question 20

The kinetic energy of a pendulum is ______________ at the bottom of its swing.

Accepted Answer

maximum (o

Exam 4: Work and Energy

The SI unit of power is the ______________.

Work is defined as force times

In lifting an object, work is done against ______________.

A system may

A 1000-kg car traveling at 70 m/s takes 3 m to stop under full braking. The same car under similar road conditions, traveling at 140 m/s, takes ______________ m to stop under full braking.

Work is the process by which energy is ______________.

The potential energy of a pendulum is least

For which of the following reasons is production of ethanol unwise?

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?

Mechanical energy

Energy provided directly from Earth's interior is called

Power is

Which of the following is(are) drawbacks to the use of methane hydrate as a fuel?

A force of 7.2 N acting on a 1.0-kg object initially at rest moves it through a parallel distance of 2.5 m. How much work is done on the object?

A 5.00-kg object is lifted from the floor to a shelf. The object's new gravitational potential energy relative to the floor is 102 J. What is the height of the shelf?

Given 10 kWh of electricity and assuming no losses, how much work, in joules, could be done?

The energy of motion is called

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

A student weighing 300 N climbed a flight of stairs 5.0 m high in 6 s. How much work was done by the student?

The kinetic energy of a pendulum is ______________ at the bottom of its swing.

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

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