How does the heat energy from the Sun reach us through the vacuum of space?
a. conduction
c. convection
b. radiation
d. none of the above choices are valid
B
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Two instruments produce a beat frequency of 5 Hz. If one has a frequency of 264 Hz, what could be the frequency of the other instrument?
A. 269 Hz B. 254 Hz C. 264 Hz D. 5 Hz E. 274 Hz
How many forces act on an upwardly tossed coin when it gets to the top of its path?
A) one; the force due to gravity B) two; gravity and the force in the coin itself C) three; gravity, the coin's internal force, and a turnaround force D) none of the above
A harmonic longitudinal wave propagating down a tube filled with a compressible gas has the form s(x, t) = sm cos (kx ? ?t). Its velocity can be obtained from
a. ?/k b. k/? c. k d. ? e. ?k
Air is considered unstable when it
A) continues to rise because it is warmer than surrounding air. B) behaves unpredictably. C) warms as it descends. D) cools as it rises.