Physics

Problem

A uniform disk of radius

0.20\,\text{m}

and mass

4.0\,\text{kg}

spins about its central axis at

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

. A bearing exerts a constant frictional torque of

0.60\,\text{N}\,\!\cdot\!\text{m}

opposite the rotation. Calculate the time required for the disk to come to rest, in seconds.