It is believed that ring galaxies form
a. when two galaxies collide nearly head on at high speed.
b. when two spiral galaxies collide, but not directly head on.
c. from a large cloud of gas and dust with very little angular momentum.
d. from a large cloud of gas and dust with a very high angular momentum.
e. when more than two galaxies collide at the same time.
A
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If both the length and the diameter of this bar are doubled, the rate at which it will conduct heat between these reservoirs will be A) 200 W B) 100 W C) 50 W D) 25 W E) 12.5 W
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