Question

A Thin Circular Ring Of Mass M And Radius R Is Rotating About Its Axis With A Constant Angular Velocity Four Objects Each Of Mass M Are Kept Gently To The Opposite Ends Of Wo Perpendicular Diameters Of The Ring. The Angular Velocity Of The Ring Will Be_____

Answer 1

Answer:

Let the final angular  velocity be w′.

Angular momentum is conserved about center of the ring.

Li=Lf

Iw+0=Iw′+2×mr2w′

Mr2w+0=Mr2w′+2×mr2w′

⟹w′=M+2mMw