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  4. The length of a simple pendulum is 39.2 / π2 m. If g =9.8 m / sec 2, the value of time period is:

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Q. The length of a simple pendulum is $39.2 / \pi^{2} \,m$. If $g =9.8 \,m / \sec ^{2}$, the value of time period is:

Solution:

$T=2 \pi \sqrt{\frac{39.2}{9.8 \times \pi^{2}}}=4\, \sec$