Question

The angular velocity of seconds hand of a watch will be

• A. $\frac{\pi}{60}rad/\sec$
• B. $\frac{\pi}{30}rad/sec$
• C. $60\pi rad/sec$
• D. $30\pi rad/sec$

Answer 1

Answer: (B)

$\frac{\pi}{30}rad/sec$

Answer 2

We know that second's hand completes its revolution (2π) in 60 sec ∴ $\omega = \frac{\theta}{t} = \frac{2\pi}{60} = \frac{\pi}{30}rad ⥂ / ⥂ \sec$