The Roche limit is the point at which:
A) the mass of an object classifies it as a moon.
B) a moon orbiting a planet experiences synchronous rotation.
C) the external tidal forces on an object are strong enough to be felt by the object.
D) the external tidal forces on an object become greater than the internal forces that hold it together.
E) the internal forces that hold an object together weaken so that the object falls apart.
D
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A. Earth B. Mars C. Mercury D. Venus
The Tully-Fisher relation exists between the galaxy's luminosity and its:
A) color. B) age. C) rotation. D) mass. E) size.
Which of the following is not a unit of radiation dose?
a. rem b. roentgen c. rad d. RBE
John throws a baseball from the outfield from shoulder height, at an initial velocity of 39.2 m/s at an initial angle of 30.0° with respect to the horizontal. The ball is in its trajectory for a total interval of 4.00 s before the third baseman catches it at an equal shoulder-height level. (Assume air resistance is negligible.) What is the ball's horizontal displacement?
a. 76.4 m c. 136 m b. 38.2 m d. zero