Rhea, Saturn's second largest moon, might best be described as:
A) having a very reflective, icy surface that is heavily cratered.
B) orbiting in a highly elliptical orbit, far from Saturn.
C) having the leading hemisphere six times darker than the following one.
D) being composed of the densest material of any Saturnian moon and dark in appearance.
E) being the only major moon of any planet not in synchronous rotation.
A
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An observer traveling with speed 0.5c moves directly toward a beacon emitting photons with speed c in her direction. The observer measure the speed approaching photons to be
(a) 0.25c (b) 0.5c (c) c (d) 1.5c
When Copernicus first created his Sun-centered model of the universe, it did not lead to substantially better predictions of planetary positions than the Ptolemaic model. Why not?
A) Copernicus used perfect circles for the orbits of the planets, though they are actually ellipses. B) Copernicus placed the planets in the wrong order going outward from the Sun. C) Copernicus misjudged the distances between the planets. D) Copernicus placed the Sun at the center, but did not realize that the Moon orbits Earth.
If an object is in equilibrium, the net torque about any arbitrary axis must be zero
Indicate whether the statement is true or false
Total Internal Reflection: Light enters a substance from air at 30.0° to the normal. It continues within the substance at 23.0° to the normal. What is the critical angle for this substance when it is surrounded by air?
A. 53° B. 51.4° C. 36.7° D. 12.6°