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Question

The period of small oscillations of a pendulum, that is bob suspended by a thread L = 20 cm in length, if it is located in a liquid whose density is 3 times less than that of bob is 5+x10 second (approximately). Find the value of x. ___


Solution

geff=WeightUpthrustMass
=vρgvρ3gvρ=23g
T=2πLgeff=2π3L2g=2π3×0.22×9.8
or T1.1s=5+610s
x=6

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