The mass of a galaxy's central black hole is related to the mass of the galactic bulge. This implies that ____
a. central black holes formed when the galaxy bulges formed
b. central black holes have grown during the galaxy's lifetime as the galactic bulge has grown
c. galactic bulges shrink over time as mass is consumed by the central black hole
d. central black holes cause the formation of galactic bulges
e. black holes are only present in spiral galaxies
a
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A piece of plastic has a net charge of +2.00 ?C. How many more protons than electrons does this piece of plastic have? (e = 1.60 × 10-19 C)
A) 1.25 × 1013 B) 1.25 × 1019 C) 2.50 × 1013 D) 2.50 × 1019
The force on a dropped apple hitting the ground depends upon
A) the speed of the apple just before it hits. B) the time of contact with the ground. C) whether or not the apple bounces. D) all of the above
The Earth's geological time scale is divided into four main
A) epochs B) periods C) eras D) eons