A circular platform is mounted on a frictionless vertical axle. Its radius `R = 2m` and its moment of inertia about the axle is `200 kg m^(2)`. It is initially at rest. A `50 kg` man stands on the edge at the platform and begins to walk along the edge at the speed of `1ms^(-1)` relative to the ground. Time taken by the man to complete one revolution is :A. `(3pi)/(2)s`B. `2pis`C. `(pi)/(2)s`D. `pis`

A circular platform is mounted on a frictionless vertical axle. Its ra

1.	A circular platform is mounted on a frictionless vertical axle. Its radius `R = 2m` and its moment of inertia about the axle is `200 kg m^(2)`. It is initially at rest. A `50 kg` man stands on the edge at the platform and begins to walk along the edge at the speed of `1ms^(-1)` relative to the ground. Time taken by the man to complete one revolution is :A. `(3pi)/(2)s`B. `2pis`C. `(pi)/(2)s`D. `pis`
Answer» Correct Answer - B `I_(1)omega_(1)+I_(2)omega_(2)=0` `200((1)/(2))+200omega_(2)=0` `omega_(2)=-(1)/(2)` `omega_(R)=omega_(1)-omega_(2)=1"rad/sec"` `T=(2pi)/(omega)=2pisec`

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