Based on galactic rotation curves and cluster dynamics, we think dark matter
A) is best detected from the X-rays it produces in the intergalactic medium.
B) comprises over 90% of the entire mass of the universe.
C) will have no effect on the fate of the universe.
D) is a minor component of the entire mass of the universe.
E) will doom the universe to collapse, overcoming the redshifts we now observe.
B
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If the average density of matter and energy in the Universe is more than the critical density, space-time will be _____
A) closed B) flat C) open D) infinite
Inelastic Collisions: In an inelastic collision involving an isolated system, the final total momentum is
A. exactly the same as the initial momentum. B. more than the initial momentum. C. less than the initial momentum.
The frequencies needed to reproduce high-quality sounds are
A) within the range of hearing. B) beyond the range of hearing. C) centered about 2000 hertz. D) none of the above
A tropical year is the same as a sidereal year
Indicate whether the statement is true or false