Question

A disc of mass m and radius r is free to rotate in a horizontal plane about a vertical smooth fixed axis passing through its centre. There is a smooth groove along the diameter of the disc and two small balls of mass m/2 each are placed in it on either side of the centre of t

Answer 1

Answer: w0/3

Explanation: as net torque is 0

So Momentum is conserved

Li=Lg

Let angular velocity of both the ball when it reaches the end is w

1/2mr^2w0=1/2mr^2+2(m/2r^2×w)

So from solving the value of w the answer is w0/3