A wheel of mass `1000 kg `and radius `1 m `is rotating at the rate of `420 r.p.m`. What is the constant torque required to stop the wheel in `14 rotations`, assuming the mass to be con-centrated at the rim of the wheel ?

A cord of negligible mass in wound round the rim of flywheel of mass 20 kg and radius 20cm mounted on a horizontal axis Calculate the angular acceleration of the wheel if a steady pull of 25N is applied on the cord. Moment of inertia of flywheel about its axis= MR^2/2