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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 | At an altitude of 4 times the radius of the earth, the acceleration due to gravity is | not given. | |
| 7 | At what angle (relative to the horizontal) should a curve 52 m in radius be banked if no friction is required to prevent the car from slipping when traveling at 12 m/s? (g = 9.8 m/s^2) | 16° | |
| 7 | At what location does an artificial Earth satellite in elliptical orbit have its greatest speed? | nearest the Earth | |
| 7 | At what speed will a car round a 52-m-radius curve, banked at a 45° angle, if no friction is required between the road and tires to prevent the car from slipping? (g = 9.8 m/s2) | 23m/s | |
| 7 | Calculate the linear speed due to the Earth's rotation for a person at a point on its surface located at 40° N latitude. The radius of the Earth is 6.40*10^6 m. | 357 m/s | |
| 7 | Calculate the linear speed due to the Earth's rotation for a person at the equator of the Earth. The radius of the Earth is 6.40*10^6 m. | 465 m/s | |
| 7 | Consider a child who is swinging. As she reaches the lowest point in her swing: | none of the above. | |
| 7 | Consider a point on a bicycle tire that is momentarily in contact with the ground as the bicycle rolls across the ground with constant speed. The direction for the acceleration for this point at that moment is: | upward | |
| 7 | Consider a point on a bicycle wheel as the wheel makes exactly four complete revolutions about a fixed axis. Compare the linear and angular displacement of the point. | Only the linear displacement is zero. | |
| 7 | Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular accelerations of the point. | Only the angular acceleration is zero. | |
| 7 | Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular velocities of the point. | Only the angular velocity is constant. | |
| 7 | Doubling the mean distance from the Sun results in changing the orbital period of revolution by what factor? | 2^3/2 | |
| 7 | For any object orbiting the Sun, Kepler's Law may be written T2 = kr3. If T is measured in years and r in units of the Earth's distance from the Sun, then k = 1. What, therefore, is the time (in years) for Mars to orbit the Sun if its mean radius from the Sun is 1.5 times the Earth's distance from the Sun? | 1.8 years | |
| 7 | Geosynchronous satellites orbit the Earth at a distance of 42 000 km from the Earth's center. Their angular speed at this height is the same as the rotation rate of the Earth, so they appear stationary at certain locations in the sky. What is the force acting on a 1 500-kg satellite at this height? | 333 N | |
| 7 | If a planet has 3 times the radius of the Earth, but has the same density as the Earth, what is the gravitational acceleration at the surface of the planet? (g = 9.8 m/s2) | 29.4 m/s^2 |
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