A circular platform is mounted on a frictionless vertical axle. Its radius 
and its moment of inertia% out the axle is 200 kg 
. It is initially at rest. A 50 kg man stands on the edge of the platform and begins to walk along the edge at the speed of 1 
relative to the ground. Time taken by the man to complete one revolution is
Text Solution
Verified by ExpertsC
As the system is initially at rest, therefore, initial angular momentum 
According to the principle of conservation of angular momentum, final angular momentum, 
Angular momentum 
Angular momentum of man is in opposite direction of platform.
i . e ., 
or 
rad 
Angular velocity of man relative to platform is
rad 
Time taken by the man to complete one revolution is
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