## Essential University Physics: Volume 1 (4th Edition)

We find: $\alpha = \frac{\tau}{I}=\frac{rF}{\frac{1}{2}mr^2}=\frac{.205\times34,000}{.5(7.7\times10^4)(2.4^2)}=.0314\ rads/s^2$ Converting the rotation speed to radians per second, we find: $37.699/.0314=1200\ s =\fbox{20 minutes}$