Q 11-03-041NEETJEE MainEasy
A disc starts from rest and rotates with a uniform angular acceleration of $2\ \text{rad/s}^2$. The number of revolutions it makes in the first $10$ s is nearly
Answer: (B) $16$
$$\theta = \frac{1}{2}\alpha t^2 = \frac{1}{2}(2)(10)^2 = 100\ \text{rad}$$
$$\text{Revolutions} = \frac{100}{2\pi} \approx 15.9 \approx 16$$
Solution by Sreeraj P, M.Sc Physics