A uniform circular disc with its plane horizontal is rotating about a vertical axis passing through its centre at a speed of 180 r.p.m. A small piece of wax of mass. 1.9 g falls vertically on the disc and sticks to it at a distance of 25 cm from the axis. If the speed of rotation is now reduced by 60 r.p.m., calculate moment of inertia of the disc. (Ans.: 2.374 x 10-4 kgm²)

A uniform circular disc with its plane horizontal is rotating about a vertical axis passing through its centre at a speed of 180 r.p.m. A small piece of wax of mass. 1.9 g falls vertically on the disc and sticks to it at a distance of 25 cm from the axis. If the speed of rotation is now reduced by 60 r.p.m., calculate moment of inertia of the disc. (Ans.: 2.374 x 10-4 kgm²)