Chapter 4 - Kinematics in Two Dimensions - Exercises and Problems - Page 106: 27

(a) $\omega = 4.7~rad/s$ (b) The period is 1.3 seconds.

(a) $\omega = (45~rpm)(\frac{2\pi~rad}{1~rev})(\frac{1~min}{60~s})$ $\omega = 4.7~rad/s$ (b) $P = \frac{2\pi~rad}{4.7~rad/s}$ $P = 1.3~s$ The period is 1.3 seconds.