A solid disc of mass is rotating about its symmetry axis with angular speed

PHYSICS · Subjective · AP · Physics 1: Algebra-based · Energy and Momentum of Rotating Systems · Energy and Momentum of Rotating Systems

Problem

A solid disc of mass

2.0\,\text{kg}

is rotating about its symmetry axis with angular speed

10\,\text{rad s}^{-1}

. The rotational kinetic energy of the disc is found to be

25\,\text{J}

. Determine the radius of the disc.