Physics

Problem

A uniform solid disk of mass

4.0\,\text{kg}

and radius

0.40\,\text{m}

moves across a horizontal surface with a translational speed of

3.0\,\text{m/s}

. At the same instant its angular speed about its center is

\omega = 10\,\text{rad/s}

. Determine the disk’s rotational kinetic energy. (For a solid disk,

I = \tfrac{1}{2}MR^{2}

.) a)

18\,\text{J}

16\,\text{J}

9.0\,\text{J}

32\,\text{J}