A circular platform is mounted on a frictionless vertical axle. Its radius R = 2 m 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 of t

Question

A circular platform is mounted on a frictionless vertical axle. Its radius R = 2 m 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 of the platform and begins to walk along the edge at the speed of 1 ms − 1 relative to the ground. Time taken by the man to complete one revolution isNEET 2012 (Mains)

TestHub · Accepted Answer

From conservation of angular momentum I ω 200 × ω ω ​ = m v r = 50 × 2 × 1 = 2 1 ​ rad / s ​ v ∴ T ​ = r ω = 1 m / s = 1 − ( − 1 ) 2 π r ​ = 2 2 π r ​ = π r = 2 π s ​

Physics - Rotation Question with Solution | TestHub

Options:

Doubts & Discussion