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Applying the Concepts
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1

According to the scientific definition of work, pushing on a rock accomplishes no work unless there is
A)movement.
B)a net force.
C)an opposing force.
D)movement in the same direction as the direction of the force.
2

The metric unit of a joule (J) is a unit of
A)potential energy.
B)work.
C)kinetic energy.
D)any of the above.
3

Which of the following is the combination of units called a joule?
A)kgm/s2
B)kg/s2
C)kgm2/s2
D)kgm/s
4

The newton-meter is called a joule. The similar unit in the English system, the foot-pound, is called a
A)horsepower.
B)slug.
C)gem.
D)foot-pound, with no other name.
5

Power is
A)the rate at which work is done.
B)the rate at which energy is expended.
C)work per unit time.
D)any of the above.
6

A power rating of 600 ftlb/s is
A)more than 1 horsepower.
B)exactly 1 horsepower.
C)less than 1 horsepower.
7

A Nm/s is a unit of
A)work.
B)power.
C)energy.
D)none of the above.
8

Which of the following is a combination of units called a watt?
A)Nm/s
B)kgm2/s2/s
C)J/s
D)all of the above.
9

About how many watts are equivalent to 1 horsepower?
A)7.5
B)75
C)750
D)7,500
10

A kilowatt-hour is actually a unit of
A)power.
B)work.
C)time.
D)electrical charge.
11

In calculating the upward force required to lift an object, it is necessary to use g if the mass is given in kg. The quantity of g is not needed if the weight is given in lb because
A)the rules of measurement are different in the English system.
B)the symbol for metric mass has the letter "g" in it, and the symbol for pound does not.
C)a pound is defined as a measure of force, and a kilogram is not.
D)a kilogram is a unit of weight.
12

The potential energy of a box on a shelf, relative to the floor, is a measure of
A)the work that was required to put the box on the shelf from the floor.
B)the weight of the box times the distance above the floor.
C)the energy the box has because of its position above the floor.
D)all of the above.
13

A rock on the ground is considered to have zero potential energy. In the bottom of a well, then, the rock would be considered to have
A)zero potential energy, as before.
B)negative potential energy.
C)positive potential energy.
D)zero potential energy, but will require work to bring it back to ground level.
14

Which quantity has the greatest influence on the amount of kinetic energy that a large truck has while moving down the highway?
A)mass
B)weight
C)velocity
D)size
15

Which of the following is a form of energy that is a kind of potential energy?
A)radiant
B)electrical
C)chemical
D)None of the above is correct.
16

Electrical energy can be converted to
A)chemical energy.
B)mechanical energy.
C)radiant energy.
D)any of the above.
17

Most energy comes to and leaves the earth in the form of
A)nuclear energy.
B)chemical energy.
C)radiant energy.
D)kinetic energy.
18

The law of conservation of energy is basically that
A)energy must not be used up faster than it is created or the supply will run out.
B)energy should be saved because it is easily destroyed.
C)energy is never created or destroyed.
D)you are breaking a law if you needlessly destroy energy.
19

The most widely used source of energy today is
A)coal.
B)petroleum.
C)nuclear.
D)water power.
20

The accounting device of a "barrel of oil" is defined to hold how many U.S. gallons of petroleum?
A)24
B)42
C)55
D)100







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