Suppose that a sound source is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound will be
A) unchanged. B) twice as great.
C) half as great. D) one-fourth as great.
A
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Which of the following web video formats is platform-independent?
A. .avi B. .mov C. .mpeg D. .wmv
Which has zero acceleration? An object
A) at rest. B) moving at constant velocity. C) in mechanical equilibrium. D) all of the above E) none of the above
Consider the star to which the arrow points. How is it currently generating energy?
A) by core hydrogen fusion B) by hydrogen shell burning around an inert helium core C) by gravitational contraction D) by core helium fusion combined with hydrogen shell burning E) by both hydrogen and helium shell burning around an inert carbon core
The strong force is to gluons as the gravitational force is to
A) Z particles. B) quarks. C) photons. D) gravitons. E) neutrinos.