1.
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Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5 min longer. Compare the work against the wall they each do.
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| Joel does 50% more work than Jerry. |
| Jerry does 50% more work than Joel. |
| Joel does 75% more work than Jerry. |
| Neither of them do any work. |
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2.
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Which of the following graphs illustrates Hooke's Law (the spring force)?
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3.
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 A simple pendulum, consisting of a mass m and a string, swings upward, making an angle q with the vertical. The work done by the tension force is
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| zero. |
| mg. |
| mg cos q. |
| mg sin q. |
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4.
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Which has more energy a 1000 kg car traveling at 1 cm/s or a 1 gm bullet traveling at 1000 m/s?
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| The Car. |
| The Bullet. |
| They are the same. |
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5.
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Which does more work a force of 89 N acting at an angle 89o or a force of 1 N acting at an angle of 1 o?
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| 89 N |
| 1 N |
| Both the same. |
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6.
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How fast would a 100 kg meteorite have to travel to have the same energy as a 10000 kg one traveling at 100 m/s?
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| 500 m/s |
| 1000 m/s |
| 5000 m/s. |
| 10000 m/s |
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7.
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A 4-kg mass moving with speed 2 m/s, and a 2-kg mass moving with a speed of 4 m/s, are gliding over a horizontal frictionless surface. Both objects encounter the same horizontal force, which directly opposes their motion, and are brought to rest by it. Which statement best describes their respective stopping distances?
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| The 4-kg mass travels twice as far as the 2-kg mass before stopping. |
| The 2-kg mass travels twice as far as the 4-kg mass before stopping. |
| Both masses travel the same distance before stopping. |
| The 2 kg mass travels greater than twice as far. |
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8.
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A 4-kg mass moving with speed 2 m/s and, an otherwise identical, 2-kg mass moving with a speed of 4 m/s, are gliding over a horizontal surface with friction and are brought to rest by it. Which statement best describes their respective stopping distances?
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| The 4-kg mass travels twice as far as the 2-kg mass before stopping. |
| The 2-kg mass travels twice as far as the 4-kg mass before stopping. |
| Both masses travel the same distance before stopping. |
| The 2-kg mass travels greater than twice as far. |
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9.
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A force that object A exerts on object B is observed over a 10-second interval, as shown on the graph. How much work did object A do during that 10 s?
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| Zero |
| 12.5 J |
| 25 J |
| 50 J |
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10.
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The resultant force you exert on a shopping cart, for a 10 s period, is plotted on the graph, shown. How much work did you do during this 10 s interval?
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| Zero |
| 12.5 J |
| 25 J |
| -25 J |
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11.
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What was the total work done on you by all the forces in the universe between the time just before you awoke this morning and right now?
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| Don't have a clue. |
| Greater than zero. |
| Zero. |
| Can not be calculated. |
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12.
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The work done by friction, f,
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| equals -fd, where d is the total distance moved. |
| equals fd, where d is the total distance. |
| can't easily be calculated because it depends on the angle between f and d. |
| can't easily be calculated. |
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13.
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A 102 kg man climbs a 5.0 meter high stair case at constant speed How much work does he do?
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| 510 J |
| 49 J |
| 5000 J |
| 2500 J |
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14.
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A 2 kg mass travelling at 1.8 m/s has a kinetic energy of
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| 3.24 J |
| 5 J |
| 6.48 J |
| 10 J |
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15.
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A person does 1000 J of work in 0.5 seconds, the average power is...
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| 2000 W |
| 1000 W |
| 500 W |
| none of the above |
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16.
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Which has more power a force of 500 N pushing a car at 50 m/s or a force of 1000 N pushing a car at 25 m/s?
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| 500 N |
| 1000 N |
| Both are the same. |
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17.
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Which exerts more power a 50 kg student climbing a 10 m high staircase at constant speed in 2 seconds or a 100 kg student climbing the same staircase in 4 seconds?
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| The 50 kg student. |
| The 100 kg student. |
| Both are the same. |
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18.
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In the previous question who does the most work?
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| The 50 kg student. |
| The 100 kg student. |
| Both the same. |
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19.
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A force that object A exerts on object B is observed over a 10-second interval, as shown on the graph. What is the average power output of A into B?
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| O W |
| 1.3 W |
| 2.5 W |
| 5 W |
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20.
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The resultant force you exert on a shopping cart, for a 10 s period, is plotted on the graph, shown. Which of the following statements are true?
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| The average power input into B is greater than zero. |
| The average power input into A is the same in the first half as the power input in the second half. |
| The average power equals the instantaneous power. |
| The average power is zero. |
