Careful observations of nearby normal and active galaxies reveal that the ass of the central black hole is well correlated with the mass of the galactic bulge. The ratio of bulge mass to black hole mass is roughly:
A) 1 to 2000.
B) 1 to 200.
C) 1 to 20.
D) 20 to 1.
E) 200 to 1.
E
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The Sun is a slightly variable star. What if the surface temperature of the Sun were to increase from 6000 K to 6100 K, what would be the increase in total power radiated assuming no other changes such as radius or emissivity?
a. 1.6% c. 3.4% b. 6.8% d. 14%
What do we mean when we say that the Sun is in gravitational equilibrium?
A) The Sun always has the same amount of mass, creating the same gravitational force. B) The Sun maintains a steady temperature. C) The hydrogen gas in the Sun is balanced so that it never rises upward or falls downward. D) There is a balance within the Sun between the outward push of pressure and the inward pull of gravity.
Which of the following statements is true?
a. A kilogram is 100 grams. b. A centimeter is 100 meters. c. A terabyte is one billion bytes. d. A megaton is one million tons. e. A micrometer is 10-6 millimeter.
Five objects of mass m move at velocity 
at a distance r from an axis of rotation perpendicular to the page through point A, as shown below. The one that has zero angular momentum about that axis is
A.
B.
C.
D.
E.
