The mass of the Moon is 7.4 × 1022 kg, its radius is 1.74 × 103 km, and it has no atmosphere. What is the free-fall acceleration at the surface of the Moon? (G = 6.67 × 10-11 N ? m2/kg2)
A) 2.8 × 106 m/s2
B) 9.8 m/s2
C) 4.9 m/s2
D) 1.6 m/s2
E) 0.80 m/s2
D
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A stone is lifted and released so that it falls to the ground. According to Galileo, it fell because
A) of its inertia. B) of electrical attraction. C) its natural motion is to fall. D) of friction. E) of gravity.
If a person's eyeball is too short from front to back, the person is likely to suffer from
A) astigmatism. B) spherical aberration. C) chromatic aberration. D) farsightedness. E) nearsightedness.
Which model of the universe gives the youngest age for the present size of the universe? (Assume that the present expansion rate is the same for all of these models. The different models have different expansion histories.)
A) a recollapsing universe B) a coasting universe C) a critical universe D) an accelerating universe E) All models give the same age.
The term 
occurs in Bernoulli's equation in Chapter 15, with ? being the density of a fluid and v its speed. The dimensions of this term are
A. M?1L5T2. B. MLT2. C. ML?1T?2. D. M?1L9T?2. E. M?1L3T?2.