Distant bright snowy mountains appear yellowish because
A) they are far away.
B) blue has been scattered away from light reflected from the mountains.
C) the color yellow looks just right.
D) of nature's wonderful preferences.
Answer: B
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What is the thermosphere?
A) the lowest layer in the atmosphere B) the part of the atmosphere that absorbs optical light C) the part of the atmosphere that absorbs ultraviolet D) the part of the atmosphere that absorbs x-rays
A fireman, 40.0 m away from a burning building, directs a stream of water from a fire hose at an angle of 30.0° above the horizontal. If the initial speed of the stream is 40.0 m/s, at what height above the nozzle will the stream of water strike the building?
a. 9.60 m c. 18.7 m b. 16.6 m d. 22.4 m
Say you are on the top of Mount Nittany. How does the force of gravity compare to what it would be at the bottom of Happy Valley?
A) two times greater on Mount Nittany than in Happy Valley B) exactly equal on Mount Nittany and in Happy Valley C) two times less on Mount Nittany than in Happy Valley D) slightly less on Mount Nittany than in Happy Valley E) slightly greater on Mount Nittany than in Happy Valley
A constant net force on a rail-road car produces constant
A) velocity. B) acceleration. C) both of these D) neither of these