safal Posts: 1, Reputation: 1 New Member #1 Nov 29, 2017, 12:50 PM
Moment of inertia
a horizontal platform in the shape of a circular disk rotates in a horizontal plane about a frictionless vertical axle.the platform has a mass M=100 kg and a radius r=2.0 m.A student whose mass is m=60 kg walks slowly from the rim of the disk towards its center. If the angular speed of the system sis 2.0 rad/s when the student is at the rim, what is the angular speed when he has reached a point r=0.5 m from the center..
 Curlyben Posts: 18,479, Reputation: 1857 Admin & Wine Expert #2 Nov 29, 2017, 01:00 PM
What do YOU think ?
While we're happy to help, we will NOt do all the work for you.
 CWH68 Posts: 26, Reputation: 2 New Member #3 Feb 13, 2018, 03:45 PM
Think Conservation of angular momentum. Compute the moment of inertia of the system before and after the student walked toward the center.

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