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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| C | I | Question | Answer |
|---|---|---|---|
| 7 | If a planet has a radius 20% greater than that of the Earth but has the same mass as the Earth, what is the acceleration due to gravity at its surface? | 6.8 m/s^2 | |
| 7 | If the mass of Mars is 0.107 times that of Earth, and its radius is 0.530 that of Earth, estimate the gravitational acceleration g at the surface of Mars. (g earth = 9.80 m/s^2) | 3.73 m/s^2 | |
| 7 | In order for a satellite to be geosynchronous, its orbit must: | be over the equator. | |
| 7 | Of the nine known planets in our solar system, the innermost is Mercury. When compared to the other planets in the system, Mercury has the: | greatest centripetal acceleration. | |
| 7 | Somewhere between the Earth and the Moon is a point where the gravitational attraction of the Earth is canceled by the gravitational pull of the Moon. The mass of the Moon is 1/81 that of the Earth. How far from the center of the Earth is this point? | 9/10 the way to the Moon | |
| 7 | Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval? | 0.50T | |
| 7 | Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At which of the following times does the average angular acceleration equal the instantaneous angular acceleration? | all of the above | |
| 7 | The acceleration due to gravity at the surface of Planet X is 10 m/s^2. What is the acceleration due to gravity at an altitude of 3000 km above the surface of this planet? | More information is needed. | |
| 7 | The distance from the center of a Ferris wheel to a passenger seat is 12 m. What centripetal acceleration does a passenger experience when the wheel's angular speed is 0.50 rad/s? | 3.0 m/s^2 | |
| 7 | The Earth is 93 million miles (mi) from the Sun and its period of revolution is 1 year = 3.15*10^7s. What is the acceleration of the Earth in its orbit about the Sun? | 3.7*10^-6 mi/s^2 | |
| 7 | The end of the cutting cord on a gas-powered weed cutter is 0.15 m in length. If the motor rotates at the rate of 20 rev/s, what is the tangential speed of the end of the cord? | 19 m/s | |
| 7 | The escape speed from the surface of the Earth is 11.2 km/s. Estimate the escape speed for a spacecraft from the surface of the Moon. The Moon has a mass 1/81 that of Earth and a radius 0.25 that of Earth. | 2.5 km/s | |
| 7 | Two satellites are monitored as they orbit the Earth; satellite X is eight times as far from the Earth's center as is satellite Y. From Kepler's third law one may conclude that the period or revolution of X is what factor times that of Y? | 22.6 | |
| 7 | What angular speed (in revolutions/second) is needed for a centrifuge to produce an acceleration of 1 000 g at a radius arm of 15.0 cm? | 40.7 rev/s | |
| 7 | What centripetal force does an 80-kg passenger experience when seated 12 m from the center of a Ferris wheel whose angular speed is 0.50 rad/s? | 240 N |
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