Answer
(a) $1\frac{rev}{h}=2\pi\frac{rad}{hr}$
(b) $2\frac{rev}{day}=\frac{1 rev}{12 hours}=\frac{2\pi rad}{12 hr}=\frac{\pi}{6}\frac{rad}{hr}$
Work Step by Step
(a)As we know that the minute hand completes one revolution in one hour so its angular speed is $1\frac{rev}{h}=2\pi\frac{rad}{hr}$
(b) The hour hand completes two revolutions in a day (24 hours), so the angular speed of the hour hand is $2\frac{rev}{day}=\frac{1 rev}{12 hours}=\frac{2\pi rad}{12 hr}=\frac{\pi}{6}\frac{rad}{hr}$
