 |
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) | kg · m/s2 |
| | B) | kg/s2 |
| | C) | kg · m2/s2 |
| | D) | kg · m/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 ft · lb/s is |
| | A) | more than 1 horsepower. |
| | B) | exactly 1 horsepower. |
| | C) | less than 1 horsepower. |
|
|
7 | |
A N · m/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) | N · m/s |
| | B) | kg · m2/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 |
|
|
16 | |
Electrical energy can be converted to |
| | A) | chemical energy. |
| | B) | mechanical energy. |
| | C) | radiant energy. |
| | D) | any of the above. |
|
|
17 | |
Most all 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 |
|
2002 McGraw-Hill Higher Education