A cord of negligible mass is wound round the rim of a fly wheel (disc) of mass 20 kg and radius 20 cm. A steady pull of 
N is applied on the cord as shown in figure. The flywheel is mounted on a horizontal axle with frictionless bearings.
(i) Find the kinetic energy of the wheel when 
of chord is unwound (Assume that the wheel starts from rest)
Text Solution
Verified by ExpertsCHECK THE SOLUTION.
(i) Let 
be the final angular velocity.
The wheel starts from rest,
The angular displacement 
(ii) Given, 
Moment of inertia of the hollow cylinder about its axis of symmetry
Torque acting on the cylinder by the applied force,
Angular acceleration produced in cylinder,
Linear acceleration, 
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