Question

The angular velocity of second's hand in a watch is:

• A. 0.82 rad/s
• B. 0.105 rad/s
• C. 0.21 rad/s
• D. 0.052 rad/s

Answer 1

Answer: (B)

Time period of a second's hand watch is $60s$.
In analogy with the concept of velocity for linear motion,
the angular velocity for rotational motion can be defined as :
Average angular velocity $=$ Change in angular position over time
Also time period of second's hand in a watch is $60s$.
$\therefore \omega =\frac{2\pi }{T}=\frac{2\times 3.14}{60}=0.105$ rad / s