Question
The angular speed of a flywheel is increased from 600 rpm to 1200 rpm in 10 s. The number of revolutions completed by the flywheel during this time is :
NEET
Physics
Rotational Motion
2026
NEET 2026 (Cancelled)
NEET Physics Question (2026) — Solution
Options
- A. 900
- B. 600
- C. 150
- D. 300
Answer
C. 150
Step-by-step solution
Initial angular speed, _0 = 600 2 60 = 20 rad/s Final angular speed, = 1200 2 60 = 40 rad/s Angular acceleration, = - _0 t = 40 - 20 10 = 2 rad/s^2 Angular displacement, = _0 t + 1 2 t^2 = 20 10 + 1 2 2 (10)^2 = 200 + 100 = 300 rad Number of revolutions, N = 2 = 300 2 = 150 Answer: 150
Related: Physics — Rotational Motion · All PYQ Banks