What is the radius of gyration of a disc of radius 20 cm, rotating about an axis passing through its - Physics - System Of Particles And Rotational Motion

Question

What is the radius of gyration of a disc of radius 20 cm,
rotating about an axis passing through its center and normal to its
plane?

Pratyay Ghosh · Accepted Answer

Let the radius of gyration is k Then for the disk,
mk2=I⇒mk2=12mr2⇒k=r2=202=102 cm

What is the radius of gyration of a disc of radius 20 cm, rotating about an axis passing through its center and normal to its plane?