The work done in increasing the angular frequency of a circular ring of mass `2kg` and radius `25cm` from 10rpm to 20rpm about is axis

What is the work done in increasing the angular frequency of a circular ring of mass 2kg and radius 25cm from 10rpm to 20rpm about its axis?

What torque will increase angular velocity of a solid disc of mass 16kg and diameter 1 m from zero to 2 rpm in 8 s ?

Find the rotational kinetic energy of a ring of mass 9kg and radius 3m rotating with 240 rpm about an axis passing through its centre and perpendicular to its plane.

Find the rotational kinetic energy of a ring of mass 9 kg and radius 3 m rotating with 240 rpm about an axis passing through its centre and perependicualr to its plane.