A uniform circular  disc  of mass 50kg and radius 0.4 m is rotating with an angular velocity
Channel: Doubtnut
Date: 05/07/2020

A uniform circular  disc  of mass 50kg and radius 0.4 m is rotating with an angular velocity of `10 rad s^(-1)` about  its own axis, which is vertical. Two uniform circular rings, each of mass 6.25 kg and radius 0.2 m, are gently placed symmetrically  on the disc in such a manner that they are touching each other along the axis of the disc and are horizontal. Assume that the friction is large enough such that the rings are at rest relative to the disc and the system rotates about the original axis. The new  angular velocity `(in red s^(-1))` of the system is