A simple pendulum completes 40 oscillations in a minute. Find its time period.

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Solution

40 oscillations in 60 sec therefore in 1 sec $f = \frac{40}{60} = \frac{2}{3} H z$
therefore $T = \frac{1}{f} = \frac{1}{\frac{2}{3}} = 1.5 s$

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