Question
A horizontal disc is freely rotating about a transverse axis passing through its centre at the rate of 100 revolutions per minute. A 20 gram blob of wax falls on the disc and sticks to the disc at a distance of \(5 cm\) from its axis. Moment of inertia of the disc about its axis passing through its centre of mass is \(2 \times 10^{-4} kg m ^2\). Calculate the new frequency of rotation of the disc.