What is the approximate latitude of the observer in the diagram below if they are located in the hemisphere containing the south celestial pole?
?
a.
20° N
b.
20° S
c.
70° N
d.
70° S
e.
0°
B
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Why does the Moon have a layer of powdery "soil" on its surface?
A) Large impacts shattered lunar rock to make this soil. B) The soil exists because the Moon accreted from powdery material after a giant impact blasted Earth. C) Volatiles escaping from the Moon's interior bubble upward and make the soil. D) The soil is the result of the same processes that make powdery sand on Earth. E) It's the result of gradual erosion by micrometeorites striking the Moon.
Suppose you are using the Doppler technique to look for planets around another star. What must you do?
A) Compare many spectra of an orbiting planet taken over a period of many months or years. B) Compare the brightness of the star over a period of many months or years. C) Carefully examine a single spectrum of an orbiting planet. D) Compare many spectra of the star taken over a period of many months or years.
The area under a graph of vx vs. t from t = ti to t = tf represents
A.
B.
C.
D.
(xi + xf).E.
A spear is thrown by you at a very high speed. As it passes, you measure its length at 1?2 its normal length. From this you conclude that the moving spear's mass must be
A. one-half its rest mass. B. twice its rest mass. C. four times its rest mass. D. None of these choices are correct.