A person of 80 kg mass is standing on the rim of a circular platform of mass 200 kg rotating about its axis at 5 revolutions per minute (rpm). The person now starts moving towards the centre of the platform. What will be the rotational speed (in rpm) of the platform when the person reaches its centre___________.

A ring of diameter 0.4 m and of mass 10 kg is rotating about its axis at the rate of 1200 rpm. The angular momentum of the ring is

A child of mass m is standing, on the periphery of a circular platform of radius R , which can rotate about its central axis. The moment of inertia of the platform is I . Child jumps off from the platform with a velocity u tangentially relative to the platform. Find the angular speed of the platform after the child jumps off.

A child of mass m is standing, on the periphery of a circular platform of radius R , which can rotate about its central axis. The moment of inertia of the platform is I . Child jumps off from the platform with a velocity u tangentially relative to the platform. Find the angular speed of the platform after the child jumps off.

A uniform horizontal circular platform of mass 200kg is rotating at 5 rpm about vertical axis passing through its centre. A boy of mass 80kg is standing at its edge. if boy moves to centre of platform, find out final angular speed

A uniform horizontal circular platform of mass 200kg is rotating at 5 rpm about vertical axis passing through its centre. A boy of mass 80kg is standing at its edge. if boy moves to centre of platform, find out final angular speed

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

(i) A person sits near the edge of a circular platform revolving with a uniform angualr speed. What will be the change in the motion of the platform ? (ii) What if the person stars moving from the edge towards the centre of the platform ?