A circular platform is mounted on a vertical frictionless axle. Its radius is r = 2m and its moment of inertia is I=200kg-m^(2). It is initially at rest. A 70 kg man stands on the edge of the platform and begins to walk along the edge at speed V_(0)=1.0m//s relative to the ground. Find the angular velocity of the platform.

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

1.	A circular platform is mounted on a vertical frictionless axle. Its radius is r = 2m and its moment of inertia is I=200kg-m^(2). It is initially at rest. A 70 kg man stands on the edge of the platform and begins to walk along the edge at speed V_(0)=1.0m//s relative to the ground. Find the angular velocity of the platform.
Answer» Solution :angular MOMENTUM of MAN = angular momentum of platform in opposite DIRECTION `mv_(0)r=Iomega""omega=0.7`rad/s