Question

The speed of the tip of a second hand of length 5 cm of a clock is _________ m/s.

Answer 1

Step 1 . Calculating circumference of clock

Circumference of the clock = $2\pi r=2\times \frac{22}{7}\times 5=31.41cm$

(As 5 cm is the radius)
It has to cover the circumference in 60 seconds.
Step 2 . Calculating speed of second hand

Therefore speed = $\frac{Distance}{Time}=\frac{31.41}{60}=0.52cm/s=0.0052m/s$.