Question 1

What is the SI unit for elastic energy?

Accepted Answer

A)  Newtons
B)  Watts
C)  Kelvins
D)  Joules D

Question 2

Mechanical work is performed when a force moves an object through a distance.

Accepted Answer

A) True 
 B)False  True

Question 3

What is the SI unit for gravitational potential energy?

Accepted Answer

A)  Newtons
B)  Watts
C)  Kelvins
D)  Joules D

Question 4

The law that simply states that energy is conserved is

Accepted Answer

A)  the 0th law of thermodynamics.
B)  the 1st law of thermodynamics.
C)  the 2nd law of thermodynamics.
D)  the 3rd law of thermodynamics.

Question 5

A stone is dropped from a bridge and allowed to free-fall downward.As it falls a certain distance its gravitational potential energy decreases by1000 J.By how much does the stone's kinetic energy increase? (Neglect air resistance).

Accepted Answer

A)  100 J
B)  500 J
C)  1000 J
D)  2000 J

Question 6

When work is done on or against an object, it changes the kinetic energy of the object

Accepted Answer

A) True 
 B)False

Question 7

In the absence if heat transfer and no work, conservation of mechanical energy states that the total mechanical energy of a system is

Accepted Answer

A)  increasing
B)  constant
C)  decreasing
D)  none of the above

Question 8

Ethanol is an alcohol-based fuel that is made from the sugars found in corn and barley.Other sources, such as rice, sugar cane, and potato skins, are also used to produce ethanol.

Accepted Answer

A) True 
 B)False

Question 9

One horsepower represents the power required

Accepted Answer

A)  to lift an object weighing 978 N, a distance of 0.762 m in 1 second.
B)  to lift an object weighting 489 N a distance of 1.676 m in 1 second.
C)  to lift an object weighting 244.5 N a distance of 3.353 m in 1 second.
D)  all of the above

Question 10

A team is more powerful than an individual because

Accepted Answer

A)  the team can do more work than the individual in the same amount of time.
B)  the team can do the same amount of work as the individual, but in less time.
C)  the team can do more work than the individual in less time.
D)  All of the above.

Question 11

The change in gravitational potential energy is found by multiplying an object's change in elevation by its

Accepted Answer

A)  mass
B)  weight
C)  density
D)  height

Question 12

Which of the following requires the most work done by the brakes of a car?

Accepted Answer

A)  slowing down from  to
B)  stopping from 
C)  equal amounts of work for both

Question 13

Power can be described as

Accepted Answer

A)  how hard you push.
B)  how fast you push.
C)  how far you push.
D)  how long you push.

Question 14

The U.S.natural gas transportation network consists of 2.4 million kilometers of mainline and secondary pipelines.

Accepted Answer

A) True 
 B)False

Question 15

Thermal energy transfer is called

Accepted Answer

A)  temperature difference
B)  heat difference
C)  temperature flux
D)  heat

Question 16

Thermal energy transfer occurs whenever there exists a temperature difference within an object, or whenever there is a temperature difference between two bodies, or a temperature difference between a body and its surroundings.

Accepted Answer

A) True 
 B)False

Question 17

In the following equation, what does the k stand for? elastic energy

Accepted Answer

A)  kinetic energy
B)  spring constant
C)  modulus of elasticity
D)  momentum

Question 18

Power is found by dividing work by what other physical quantity?

Accepted Answer

A)  distance
B)  mass
C)  force
D)  time

Question 19

A direct passive solar system uses large glass areas on the south wall of a building and a thermal mass to collect the solar energy.

Accepted Answer

A) True 
 B)False

Question 20

Work is found by multiplying force by what other physical quantity?

Accepted Answer

A)  distance
B)  mass
C)  power
D)  time

Exam 13: Energy and Power

What is the SI unit for elastic energy?

Mechanical work is performed when a force moves an object through a distance.

What is the SI unit for gravitational potential energy?

The law that simply states that energy is conserved is

A stone is dropped from a bridge and allowed to free-fall downward.As it falls a certain distance its gravitational potential energy decreases by1000 J.By how much does the stone's kinetic energy increase? (Neglect air resistance) .

When work is done on or against an object, it changes the kinetic energy of the object

In the absence if heat transfer and no work, conservation of mechanical energy states that the total mechanical energy of a system is

Ethanol is an alcohol-based fuel that is made from the sugars found in corn and barley.Other sources, such as rice, sugar cane, and potato skins, are also used to produce ethanol.

One horsepower represents the power required

A team is more powerful than an individual because

The change in gravitational potential energy is found by multiplying an object's change in elevation by its

Which of the following requires the most work done by the brakes of a car?

Power can be described as

The U.S.natural gas transportation network consists of 2.4 million kilometers of mainline and secondary pipelines.

Thermal energy transfer is called

Thermal energy transfer occurs whenever there exists a temperature difference within an object, or whenever there is a temperature difference between two bodies, or a temperature difference between a body and its surroundings.

In the following equation, what does the k stand for? elastic energy

Power is found by dividing work by what other physical quantity?

A direct passive solar system uses large glass areas on the south wall of a building and a thermal mass to collect the solar energy.

Work is found by multiplying force by what other physical quantity?