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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 1 > Chapter 11 - Rotational Motion > A uniform horizontal circular platform of mass 200kg is rotating at 10 rpm about a vertical axis passing through its center. A boy of mass 50kg is standing at its edge. If the boy moves to the center of the platform, the frequency of rotation would become

A uniform horizontal circular platform of mass 200kg is rotating at 10 rpm about a vertical axis passing through its center. A boy of mass 50kg is standing at its edge. If the boy moves to the center of the platform, the frequency of rotation would become

A solid sphere is rotating about a diameter at an angular velocity ω. If it cools so that its radius reduces to I/n of its original value its angular velocity becomes