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A wheel of radius 0.4m can rotate freely...

A wheel of radius `0.4m` can rotate freely about its axis as shown in the figure. A string is wrapped over its rim and a mass of `4 kg` is hung. An angular acceleration of `8 rad//s^(2)` is produced in it due to the torque. Then, the moment of inertia of the wheel is (`g=10m//s^(2)`)

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