FM radio only operates in the frequency range 88 MHz to 108 MHz because
a. higher or lower frequencies are blocked by the ionosphere
b. higher and lower frequencies are not radio waves
c. the government set those limits
d. none of the above
C
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A solid sphere, solid cylinder, and a hollow pipe all have equal masses and radii. If the three of them are released simultaneously at the top of an inclined plane and do not slip, which one will reach the bottom first?
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