Question

A circular platform is mounted on a vertical frictionless
axle. Its radius is r = 2 m and its moment of inertia
I = 200 kg m-. 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=1ms relative to the ground. The
angular velocity of the platform is
(a) 1.2 rad s 1 (b) 0.4 rad s 1
(c) 0.7 rad s-1 (d) 2 rads1
​

Answer 1

angular velocity of the platform is 0.7 rad s-1