Question

The radius of gyration of a body about an axis at a distance of $6\, cm$ from its centre of mass is $10\, cm$. Then, its radius of gyration about a parallel axis through its centre of mass will be

• A. 800 cm
• B. 8 cm
• C. 0.8 cm
• D. 80 m

Answer 1

Answer: (B)

8 cm

Answer 2

$T_{A B}=I_{ CM }+M h^{2}$ $M K_{AB}^{2}=M K_{ CM }^{2}+M h^{2}$ $K_{A B}^{2}=K_{ CM }^{2}+h^{2}$ Given, $K_{A B}=10\, cm,\, h=6\, cm$ Putting them, we get $K_{ CM }=8\, cm$