Question

A stationary wheel starts rotating about its own axis at an angular acceleration $5.5tad/s^2.$ To acquire an angular velocity 420 revolutions per minute, the number of rotations made by the wheel is

• A. 14
• B. 21
• C. 28
• D. 35

Answer 1

Answer: (C)

28

Answer 2

$Irpm = \frac{\pi}{30} rads^{-1}$ ; $\omega^2 = 2 \alpha \theta$