Q. The angular speed of a fly wheel making $120\ revolutions/minute$ is
A) $2\pi\ rad/s$
B) $4\pi^{2}\ rad/s$
C) $\pi\ rad/s$
D) $4\pi\ rad/s$
Explanation
(d) $120\ rev/\min = 120 \times \frac{2\pi}{60}\ rad/\sec{= 4\pi\ rad/sec}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.