(A) The angular speed $\omega$ is defined as the ratio of angular displacement $\Delta \theta$ to the time interval $\Delta t$. For the hour hand of a

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$\frac{\pi}{6} \text{ rad h}^{-1}$

(A) The angular speed $\omega$ is defined as the ratio of angular displacement $\Delta \theta$ to the time interval $\Delta t$. For the hour hand of a clock,it completes one full revolution ($2\pi$ radians) in $12$ hours. Therefore,$\omega = \frac{\Delta \theta}{\Delta t} = \frac{2\pi \text{ rad}}{12 \text{ h}} = \frac{\pi}{6} \text{ rad h}^{-1}$.