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Q21: A spacecraft can gain energy by passing
Q25: You shout at a cliff,and hear your
Q31: occurs when sound passes through an open
Q45: The net force points downward.
Q68: When the frequency of the source of
Q76: In a steam engine,steam at 140°C in
Q81: How come birds can land on overhead
Q89: Linear momentum is definitely conserved.
Q113: Reverberation can both inhibit conversation and enhance
Q150: The maximum displacement of points on a