Physics: Rotational, Projectile, Satellite Motion, Gravity
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17 terms
Terms | Definitions |
|---|---|
 A space habitat is designed so that the variation in g between a person's head and feet is less than 0.01 g. If the person is 2m tall, then the min. radius of the habitat is... | 200 m. |
| A flywheel's diameter is twice that of another of the same shape & mass. The larger flywheel's rotational inertia is... | TWO times the other's. |
| Since each rolling wheel of a railroad train is tapered, the narrow part of the wheel has a tangential speed that is... | SMALLER than that of the wide part. |
| If the earth rotated SLOWER about its axis, your apparent weight would... | INCREASE. |
| Half way to the center of a completely hollow planet with a thin uniform shell, your weight there compared to your weight on the outer surface would be... | ZERO. |
| The reason the moon does not crash into the Earth is that the... | moon has a sufficient TANGENTIAL SPEED. |
| The concept of FORCE is not fundamental to... | Einstein's Theory of Gravitation |
| Th force of gravity does work on a satellite when it is in... | ELLIPTICAL orbit. |
| Toss a baseball bat into the air and it wobbles about its... | CENTER OF MASS! |
| A carnival has a Ferris wheel where the seats are located halfway between the center & the outside rim. Compared with a Ferris wheel with seats on are the outside rim, your ANGULAR speed while riding on this Ferris wheel would be... | the SAME and your TANGENTIAL SPEED less. |
| A vertically-oriented rocket that is somehow able to maintain a continuous upward velocity of 8 km/s will... | ESCAPE from the Earth! |
| A hunter on level ground fires a bullet at an angle of 2 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first? | The FIRED one. |
| Tangential Speed | ~ The speed of something moving along a CIRCULAR path. (direction of motion is always TANGENT to the circle!) ~ DIRECTLY PROPORTIONAL to Rotational Speed (@ a fixed radial distance) |
| Rotational Speed | ~ aka: Angular Speed ~ Refers to the # of ROTATIONS/revolutions per min. |
| Torque | ~ the ROTATIONAL counterpart of Force ~ If you want to make a stationary object rotate, apply Torque! ~ Equals: Lever Arm x Force |
| Angular Momentum | ~ Angular Momentum = (mass)(velocity)(radius) ~ "Inertia of rotation" of rotating objects ~ AM = (rotational inertia)(rotational velocity) |
| Conservation of Angular Momentum | ~ I = rotational inertia ~ w = rotational velocity ~ BIG I, small w => weights extended out, rotate slower ~ small I, BIG W => weights pulled in, rotate faster! |
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