## Essential University Physics: Volume 1 (3rd Edition)

$7.14 \ s$
We first convert rpm to radians per second. We must find the difference in the two frequencies in order to solve. Thus, we find: $f_1 = \frac{\omega}{2\pi}=\frac{103.09}{2\pi}=16.41\ Hz$ $f_2 = \frac{\omega}{2\pi}=\frac{103.934}{2\pi}=16.55\ Hz$ Thus, the difference is .14 Hz. This means: $T = \frac{1}{.14} = 7.14 \ s$