Q. The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200 rpm to 3120 rpm in 16 seconds. The angular acceleration in $rad/s^2$ is :
A) $104\pi$
B) $2\pi$
C) $4\pi$
D) $12\pi$
Explanation
[Solution] $\alpha = \frac{2\pi(3120-1200)/60}{16} = \frac{2\pi \times 32}{16} = 4\pi\ rad/s^2$. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.