Question

The angular speed of a fly-wheel making 120 revolution/minute is:

• A. p rad/sec
• B. 2p rad/sec
• C. 4p rad/sec
• D. 4p2 rad/sec

Answer 1

Answer: (C)

4p rad/sec

Answer 2

$\omega = 2\pi n = 2\pi \times \frac{120}{60} = 4\pi rad ⥂ / ⥂ s$