1.
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A 1 kg block is on a frictionless surface subject to two equal yet opposite forces for 0.25 seconds as shown in the animation (position is in meters and time is in seconds). Which of the following animations represents a physical result?
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| Animation 1, 2, 3, 4, 5 |
| Animation 1, 3, 5 |
| Animation 2, 4, 5 |
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2.
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Consider a 2 kg Physics textbook pressed against a wall as shown in the animation (position is in meters and time is in seconds). Given that mk = 0.4 between the wall and the textbook, determine the force on the book perpendicular to the wall. Start
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| 39N |
| 49 N |
| 19N |
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3.
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A 12 kg box slides down a rough ramp as shown in the animation (position is in meters and time is in seconds). From the animation determine the magnitude of the force of friction. Start
Interactive Hint
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| 0 N |
| 52.6 N |
| 105.2 N |
| 63.1 N |
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4.
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A 1.5 kg block receives a push and in the process pushes against a 4.5 kg block as shown in animation 1: Start Animation 1 (position is in meters and time is in seconds). Conversely, in animation 2, the same 4.5 kg block receives the same push, now from the opposite direction and in the process pushes against the 1.5 kg block as shown: Start Animation 2 . Determine the force of the large block on the small block in both cases. Do you expect both forces to have the same magnitude?
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| -11.7 N / -3.9 N |
| 11.7 N / -3.9 N |
| 11.7 N / -11.7 N |
| 3.9 N / -3.9 N |
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5.
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A metal bar is stretched by a force as shown in the animation (position is in centimeters and time is in seconds). What is the strain that results in the material? Start
|
| 0.052 |
| 0.05 |
| 0.048 |
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6.
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An aluminum bar (Young's modulus of 70 x 109 N/m2) is stretched by a force as shown in the animation (position is in centimeters and time is in seconds). Assume the bar has a square cross section. What is the force required to elongate the aluminum? Start
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| 1.5 x 104 N |
| 1.5 x 108 N |
| 3.1 x 105 N |
| 1.5 x 105 N |
