Q .14.23 A circular disc of mass is suspended by a wire attached to its centre. The wire is twisted by rotating the disc and released. The period of torsional oscillations is found to be
The radius of the disc is
. Determine the torsional spring constant of the wire. (Torsional spring constant
is defined by the relation
, where J is the restoring couple and θ the angle of twist).
Moment of Inertia of the disc about the axis passing through its centre and perpendicular to it is
The period of Torsional oscillations would be