Question

The ratio of the radii of gyration of a circular disc about a tangential axis in the plane of the disc and of a circular ring of the same radius about a tangential axis in the plane of the ring is

• A. $2:3$
• B. $2:1$
• C. $\sqrt{5}:\sqrt{6}$
• D. $1:\sqrt{2}$

Answer 1

Answer: (C)

$\sqrt{5}:\sqrt{6}$

Answer 2

If a body has mass M and radius of gyration is K, then $I=M{{K}^{2}}$ .