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BITSAT 2020
Exam
BITSAT
Year
2020
Subject
Physics
Chapter
Motion in Two Dimensions

BITSAT 2020 · Physics · Motion in Two Dimensions

A wheel is rotating at 900 r .p.m. about its axis. When power is...

A wheel is rotating at 900r900 \mathrm{r}.p.m. about its axis. When power is cut offit comes to rest in 1 minute. The angular retardation in rad/\mathrms2\mathrm{rad} / \mathrms^{2} is

Options

  1. Aπ/2\pi / 2
  2. Bπ/4\pi / 4
  3. Cπ/6\pi / 6
  4. Dπ/8\pi / 8

Correct answer

A. π/2\pi / 2

Step-by-step solution

Angular retardation, α=ω2−ω1t=2π(n2−n1)t=2π(0−900/60)60=π2rad/\mathrms2\begin{aligned} \alpha &=\frac{\omega_{2}-\omega_{1}}{t}=\frac{2 \pi\left(\mathrm{n}_{2}-\mathrm{n}_{1}\right)}{\mathrm{t}} \\ &=\frac{2 \pi(0-900 / 60)}{60}=\frac{\pi}{2} \mathrm{rad} / \mathrms^{2} \end{aligned}
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