Question

what is the angular speed of hour hand of a clock? If what the angular displacement of hour hand in time 20 minutes.​

Answer 1

Angular speed is angle rotated in unit time.

So hot hand rotates one complete circle in 12 hrs.

So Angular speed =

$\frac{2\pi}{1}$

That is in radians per hr.

Now for 12 hours i. e 12 * 60 min the hour hand rotates

$2\pi$

Radians.

So in 20 min

$\frac{2\pi}{(12 \times 60)} \times 20$

Will be your answer.