Question

A stationary wheel starts rotating about its own axis at uniform angular acceleration $8rad/s^2.$ The time taken by it to complete rotations is

• A. 5.5 sec
• B. 7sec
• C. 11 sec
• D. 14 sec

Answer 1

Answer: (C)

11 sec

Answer 2

Given $\omega_1=0$ $\alpha=8\,ras\,s^{-2}$ $\theta=77(2\pi)=154\pi\,rad$ $t=\sqrt {\frac{2\theta}{\alpha}}$