As a parcel of air at high altitude sinks to a lower elevation with no heat input or output, its temperature
A) increases.
B) decreases.
C) will remain unchanged.
Answer: A
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In winter, light-colored clothes will keep you warmer than dark-colored clothes if
a. you are warmer than your surroundings. b. you are at the same temperature as your surroundings. c. you are cooler than your surroundings. d. you are standing in sunlight.
Magnifying Glass With the Image at Infinity: A lens of focal length 90 mm is used as a magnifier by a person with a near point of 25 cm. The object being viewed is 9.9 mm long, and is positioned at the focal point of the lens. What is the angle subtended by the image at infinity, in milliradians?
A. 110 mrad B. 73 mrad C. 37 mrad D. 147 mrad E. 183 mrad
Two speakers emit coherent sound waves into the open air. One of them produces 75 W of power. If a microphone placed at 12 m from each of the two speakers receives a total intensity of 0.25 
what is the power output of the second speaker?
A. 151 W B. 377 W C. Need more info to solve. D. 38 W
Which of the speeds v listed below is the lowest speed where the probability of a gas molecule having that speed is negligible compared to that for v = vp (“negligible” meaning less than 1/100 of its value at v = vp ).
A. v ? 0.2 vp B. v = 2 vp C. v = 3 vp D. v = 5 vp