As air rises, it
A) compresses and warms.
B) compresses and cools.
C) expands and warms.
D) expands and cools.
Answer: D
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At temperatures well below half of the melting temperature, the primary mechanism of creep strain in metals is
(a) Cobel creep. (b) Dislocation glide. (c) Dislocation creep. (d) Herring-Nabarro vacancy flux
Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be ________
A) well below the freezing point of water B) slightly cooler, but still above freezing C) slightly warmer, but still well below the boiling point of water D) about the same as it is now
A 5.0-m long, 12-kg, ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A) 4.0 m B) 3.7 m C) 1.7 m D) 1.3 m E) 3.3 m
Which space telescope is observing X-rays?
A. the Spitzer Space Telescope B. the Hubble Space Telescope (HST) C. the Chandra Observatory D. the Extreme Ultraviolet Explorer (EUVE)