Physics

Problem

A solid disk of mass

4.0\,\text{kg}

and radius

0.30\,\text{m}

spins at

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

. A constant frictional torque of

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

opposes the motion. Approximately how long will it take for the disk to come to rest? a)

18\,\text{s}

36\,\text{s}

29\,\text{s}

72\,\text{s}