Question

If a solid sphere is rolling the ratio of its rotational energy to the total kinetic energy is given by:

• A. $7:10$
• B. $2:5$
• C. $10:7$
• D. $2:7$

Answer 1

Answer: (D)

$\frac{K_R}{K_{Total}}=\frac{K^2/R^2}{1+\frac{K^2}{R^2}}=\frac{2}{7}$
( $\frac{K^2}{R^2}=\frac{2}{5}$ for solid sphere )