1.
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A very wealthy individual proposes to dig a hole through the center of the Earth and run a train (the small black circle) from one side of the Earth to the other as shown in the animation (position is in Earth radii and time is in seconds). Which of the animations correctly depicts the motion of the train? Ignore frictional effects and assume the Earth is a uniform mass distribution.
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| Animation 1 |
| Animation 2 |
| Animation 3 |
| Animation 4 |
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2.
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A planet orbits a star as shown in the animation (position is in RES and time is in earth days). Determine the mass of the star (The star is yellow). Start
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| 2 x 1030 kg |
| 1.3 x 1032 kg |
| 6.8 x 1023 kg |
| 5.1 x 1033 kg |
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3.
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Two planets orbit a star whose mass is M = 7 x 1025 kg, as shown in the animation (position is in 106 km and time is in earth years). Determine the mass of the orbiting planets (The star is red). Start
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| Cannot determine, the mass drops out. |
| 2.4 x 1025 kg |
| 6 x 1024 kg |
| 3 x 1030 kg |
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4.
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A planet has an initial velocity in the y-direction that gives it a slightly elliptical orbit around a star as shown in the animation (position given in 106 km and time is in years). Determine the mass of the star. You may drag the planet to the right orbital radius at t=0 (use the reset button), then drag the gray blocks around the applet to test. Start
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| M = 3.8 x 1032 kg. |
| M = 3.7 x 1041 kg. |
| M = 2.0 x 1032 kg. |
| M = 4.2 x 1032 kg. |
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5.
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The animation purports to model a solar system, however the planet shown is not in circular or elliptical orbit as shown in the animation (position is in 104 km and time is in years). Could this represent a physical situation? Why? Start
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| Physical, there is nothing wrong with that orbit. |
| Physical, there is another planet off screen causing the wobble. |
| Not Physical, there is no way a planet could move this way |
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6.
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The animation purports to model a solar system, however one of the planets does not obey all of Kepler's laws (position is in 106 km and time is in earth years). Identify that planet. (The sun is yellow.) Start
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| green |
| blue |
| black |
| red |
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7.
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A satelite orbits a planet as shown on the animation (position is in 103 km and time is in earth days). If the satelite's orbit above the planet was doubled, what would its speed have to be in order to stay in a circular orbit? Start
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| 2.2 m/s |
| 33.0 m/s |
| 23.5 m/s |
| 25.5 m/s |
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8.
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The animation shows a comet orbiting a star (position is in 106 km and time is in earth years). Determine the mass of the star. Start
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| 1.1 x 1024 kg. |
| 1.4 x 1023 kg. |
| 6.6 x 1022 kg. |
| 1.4 x 1011 kg. |
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9.
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A rocket accelerates upward while a ball is fired into the opening in the rocket as shown in the animation (position is in meters and time is in seconds). The rocket and the ball are far from any massive object. For an observer in the elevator, what acceleration does the ball appear to have? Start
Interactive Hint
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| -6 m/s2 |
| 6 m/s2 |
| 0 m/s2 |
| -3 m/s2 |
