The Milky Way galaxy is about
A) 4 light years in diameter.
B) 40 light years in diameter.
C) 100 light years in diameter.
D) 100,000 light years in diameter.
Answer: A
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Assume that D and R have units of meters, T has units of seconds, m and M have units of kilograms, has units of meters per second, and has units of m/s2. Which of the following equations has self-consistent units?
A. D = mR2
B. m = M[1 + R2]
C. D = [1 – m/M]gT2
D. 
= mv2/R
E. D = 
2/RT
F. None of these can be correct.
A ball rolls along a horizontal track in a certain time. If the track has a small upward dent in it, the time to roll the length of the track will be
A) less. B) the same. C) more.
Two nuclei which share the same atomic number Z always are
a. stable. b. unstable. c. isotopes. d. isobars. e. radioactive.
Evidence to support that the inner core is solid and the outer core is liquid comes from
A) refraction of seismic waves as they encounter different mediums. B) the wave shadow effect of P- and S-waves as they encounter the solid and liquid core. C) the wave shadow effect of P- and S-waves, and the increase in velocity of P-waves as they encounter the solid inner core. D) the inner core is not solid, but is liquid.