Question

A disc, of radius 12 cm and mass 150g, is suspended horizontally by a long wire at its centre. Its period T1 of angular SHM Is measured to be 84 s. An irregularly shaped object X is then hung from the same wire and its period T2 of angular SHM is found to be 4.76s. What is the moment of inertia of the object X about its suspension axis?

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An irregu- larly sheped object x is then hung from the same wire and its period T2 of angu- lar SMM is found to be 4.76 s