What are the two key observational facts that led to widespread acceptance of the Big Bang model?
A) the cosmic background radiation and the high helium content of the universe
B) the cosmic background radiation and the expansion of the universe
C) the cosmic background radiation and the near-critical density of the universe
D) the predominance of matter over antimatter and the near-critical density of the universe
E) the predominance of matter over antimatter and the large scale structure of galaxies
A
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If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?
a. 8.75 × 10^3 Mpc b. 2.4 × 10^9 Mpc c. 5.6 × 10^5 Mpc d. 114 Mpc e. 8.75 × 10^-3 Mpc
Asteroids ________.
A. are about the same size as planets, but have not pulled themselves into a spherical shape B. are small bodies, typically the size of a grain of sand or a boulder C. are larger objects, a few hundred kilometers in size, but not quite large enough to be classified as a planet D. can range in size from a few meters to many hundreds of kilometers
Starting from rest, a wheel undergoes constant angular acceleration for a period of time T. At what time after the start of rotation does the wheel reach an angular speed equal to its average angular speed for this interval?
a. 0.25T b. 0.50T c. 0.67T d. 0.71T
Which of the following is a cloud of vertical development?
A. cirrus B. cumulonimbus C. nimbostratus D. stratocumulus