Which of the following is true of the cosmic microwave background?
A) It is radiation that existed before the big bang.
B) It appears to come from a blackbody.
C) It is radiation present in the ultraviolet spectrum.
D) It has a very small redshift of about 10.
B
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The period of Jupiter's orbit around the Sun is approximately 12 years. What is the approximate distance from the Sun to Jupiter?
a. 144 AU b. 1728 AU c. 42 AU d. 5.2 AU e. 2.3 AU
Free Fall: A rock is projected upward from the surface of the Moon, at time t = 0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is 1.62 m/s2, and the Moon has no atmosphere. The height of the rock when it is descending with a speed of 20.0 m/s is closest to
A. 115 m. B. 125 m. C. 135 m. D. 145 m. E. 154 m.
Oxygen is the most common element in minerals in Earth's crust, which is why the release of gases from the crust over time has produced an atmosphere rich in oxygen today.
Answer the following statement true (T) or false (F)
Which statement below correctly describes the relationship between expansion rate and age for the universe?
A) The faster the rate of expansion, the younger the age of the universe. B) The faster the rate of expansion, the older the age of the universe. C) Age is independent of the expansion rate.