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**[SOLVED] Rotational Kinetic Energy**

**1. Homework Statement**

A solid cylinder of mass 14.0 kg rolls without slipping on a horizontal surface.

(a) At the instant its center of mass has a speed of 11.0 m/s, determine the translational kinetic energy of its center of mass.

**2. Homework Equations**

[tex] I_cm = \frac{1}{2}MR^2 [/tex]

[tex]K_R = \frac{1}{2}I\omega^2 [/tex]

**3. The Attempt at a Solution**

I can't figure out how to find the moment of inertia without have a radius... any hints?