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1 | |
According to the scientific definition of work, pushing on a rock accomplishes no work unless there is |
| | A) | an applied force greater than its weight. |
| | B) | a net force greater than zero. |
| | C) | an opposing force. |
| | D) | movement in same direction as the force. |
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2 | |
The metric unit of a joule (J) is a unit of |
| | A) | potential energy. |
| | B) | work. |
| | C) | kinetic energy. |
| | D) | all of the above. |
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3 | |
Power is |
| | A) | the rate at which energy is expended. |
| | B) | work per unit of time. |
| | C) | the rate at which work is done. |
| | D) | any of the above. |
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4 | |
A Nm/s is a unit of |
| | A) | energy. |
| | B) | power. |
| | C) | force. |
| | D) | work. |
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5 | |
The kilowatt-hour is a unit of |
| | A) | power. |
| | B) | work. |
| | C) | time. |
| | D) | force. |
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6 | |
The potential energy of a box on a shelf, relative to the floor, is a measure of |
| | A) | the work done putting 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) | any of these. |
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7 | |
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 |
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8 | |
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. |
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9 | |
The law of conservation of energy is a statement that |
| | A) | energy must be conserved and you are breaking a law if you waste energy. |
| | B) | the supply of energy is limited so we must conserve it. |
| | C) | the total amount of energy is constant. |
| | D) | energy cannot be used faster than it is created. |
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10 | |
Energy is |
| | A) | the ability to do work. |
| | B) | the work needed to create potential or kinetic energy. |
| | C) | the work that can be done by an object with PE or KE. |
| | D) | all of the above. |
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11 | |
According to the scientific definition of work, pushing on a rock accomplishes no work unless there is |
| | A) | an applied force greater than its weight. |
| | B) | a net force greater than zero. |
| | C) | an opposing force. |
| | D) | movement in same direction as the force. |
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12 | |
How many U.S. gallons of petroleum does the accounting device of a "barrel of oil" hold? |
| | A) | 24 |
| | B) | 42 |
| | C) | 55 |
| | D) | 100 |
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13 | |
When you do work on something, you |
| | A) | leave it with less energy than it had before. |
| | B) | move it in a direction 90° to the direction of the applied force. |
| | C) | give it energy. |
| | D) | none of these. |
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14 | |
An automobile engine with more power |
| | A) | can do the same work at a lesser rate. |
| | B) | can do less work over a greater time period. |
| | C) | requires less time to do the same amount of work. |
| | D) | none of these. |
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15 | |
A light bulb rated at 100 W does not mention a time factor because the time is |
| | A) | not used in power ratings of light bulbs. |
| | B) | already included in the definition of a watt. |
| | C) | considered in energy consideration other than light bulbs. |
| | D) | not important because bulbs always use the same amount of energy. |
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16 | |
Energy is conserved |
| | A) | in any and all energy transformations. |
| | B) | only when energy changes from one form to another. |
| | C) | very rarely, since some is needed to run machines. |
| | D) | most of the time, but not always. |
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17 | |
How much work is done in raising a 10.0 kg backpack from the floor to a shelf 1.50 m above the floor? |
| | A) | 150 J |
| | B) | 155 J |
| | C) | 15.0 J |
| | D) | 15.1 J |
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18 | |
If 5,000 J of work is used to raise a 100 kg crate to a high shelf in a warehouse, how high was the crate raised? |
| | A) | 5 m |
| | B) | 50 m |
| | C) | 980 m |
| | D) | 4,020 m |
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19 | |
A 60.0 kg student runs up a 5.00 meter high stairway in a time of 3.94 seconds. How many watts of power did she develop? |
| | A) | 76.1 W |
| | B) | 15.2 W |
| | C) | 300 W |
| | D) | 750 W |
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20 | |
How many horsepower is a 1400 W blowdryer? |
| | A) | 1.9 hp |
| | B) | 2.5 hp |
| | C) | 2.0 hp |
| | D) | The answer to this question is not possible. |
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21 | |
What is the kinetic energy of a 2,000 kg car that is moving at 72 km/h? |
| | A) | 5,184 kJ |
| | B) | 400 kJ |
| | C) | 20 kJ |
| | D) | 40 kJ |
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22 | |
How much work is needed to stop a 1,000.0 kg car that is moving straight down the highway at 54.0 km/h? |
| | A) | 7.5 kJ |
| | B) | 113 kJ |
| | C) | 225 kJ |
| | D) | 1,458 kJ |
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23 | |
If you could "bundle" water, what would be the velocity of a water bundle that falls 100.0 m through the penstock of a hydroelectric dam? |
| | A) | 44 m/s |
| | B) | 1,960 m/s |
| | C) | 200.0 m/s |
| | D) | 980 m/s |
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24 | |
A 1000.0 kg car stops on top of a 50.0 m hill. How much energy was used in climbing the hill? |
| | A) | 50,000 J |
| | B) | 9,800 J |
| | C) | 20 J |
| | D) | 490 kJ |
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25 | |
A 880 N box is pushed across a level floor for a distance of 5.0 m with a force of 440 N. How much work was done on the box? |
| | A) | 2,200 J |
| | B) | 4,400 J |
| | C) | 6,600 J |
| | D) | 5,500 J |
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26 | |
A force of 200 N is needed to push a table across a level classroom floor for a distance of 3 m. How much work was done on the table? |
| | A) | 600 J |
| | B) | 200 J |
| | C) | 203 J |
| | D) | 5880 J |
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