An observer on Earth's equator would find _______
a. the celestial equator passing at 45 degrees above the northern horizon.
b. the celestial equator passing at 45 degrees above the southern horizon.
c. that the celestial equator coincides with the horizon.
d. the celestial equator passing directly overhead.
e. None of the other choices are true.
d
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When studying the structure of ocean waves one could look at all of the following except _______.
a. Wave length b. Tidal force c. Wave height d. Period
The H-R diagram is a plot of stars' ________.
A. luminosity vs. temperature B. mass vs. diameter C. temperature vs. mass D. mass vs. luminosity
Kepler's Third, or harmonic, law states that the
A. semi-major axis of an orbit is inversely proportional to the period. B. planets move fastest when they are closest to the Sun. C. period of an orbit cubed equals the semi-major axis squared. D. semi-major axis of an orbit cubed equals the period squared.
Conservation of angular momentum means that a spinning body tends to:
A) fly apart. B) slow down. C) wobble into an eccentric orbit. D) gravitationally collapse. E) keep spinning.