A source emits sound at a fixed constant frequency f.If the temperature of the air rises, the frequency you hear is
a. the same as f. b. higher than f.
c. lower than f. d. unrelated to f.
a
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Which factor(s) in the Drake equation (Number of Civilizations = NHP × flife × fcivilization × fnow) can we estimate based on discoveries of extrasolar planets?
A) NHP B) flife C) fcivilization D) fnow E) all of the above
In two-dimensional collisions momentum conservation is
A. In the x or y direction, but not both B. In both the x and y directions C. In the y direction only D. In the x direction only
To achieve a high equivalent resistance for a pair of resistors, connect them in
A) series. B) parallel. C) either of these
What is the terminal velocity of an 80.00-kg mass object in falling with a drag force with a magnitude that depends on speed, v, as Fdrag = (12.0 N?s/m)v + (4.00 N?s/m)v2?
A) 6.45 m/s B) 72.2 m/s C) 34.2 m/s D) 12.6 m/s E) 47.3 m/s