A classical mechanics problem by Pratik Shastri

A pendulum oscillates, immersed in water. The mass of the bob is 250 g250 \ g, length of the string is 30 cm30 \ cm, the radius of the bob is 2 cm2 \ cm and density of water ρw\rho_w is 1000 kg/m31000 \ kg/m^3.

Calculate the time period of its oscillations (in seconds), considering its amplitude to be small.


\bullet Take g=9.8 m/s2g=9.8 \ m/s^2

\bullet Ignore drag forces.


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