What is the time period of a pendulum that completes 20 oscillations in 5.0 seconds?
There are 20.0 over 5.0 = 4.0 oscillation in 1 second, so the frequency is 4.0Hz. T = 1 over f, therefore T = 1 0ver 4.0Hz, therefore T = 0.25s. Therefore the time period is 0.25 seconds.
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