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Strong winds can make a tall skyscraper set into a back-and-forth motion. The amplitudes of
these motions are much larger at the higher floors than the lower ones. The Sears Tower in
Chicago on a windy day sometime makes about 16.5 vibrations in 60 seconds. Determine the
frequency and the period of vibration of the Tower.
O 3.2 Hz, 0.364 s
O 0.28 Hz, 3.64 s
0.28 rpm, 36 s
2.3 Hz, 0.40 s

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