Physics Circle home Student Login

Home›Chapters›Rotational Motion PYQs›Rotational Kinematics & Dynamics›Question 30

JEE Main 2022 (24 Jun, Shift 2) · Rotational Kinematics & Dynamics

Rotational Kinematics & Dynamics question from JEE Main 2022 (24 Jun, Shift 2)

Q30JEE Main 2022 · 24 JUN · SHIFT 2Easy

Rotational Kinematics & Dynamics

A fly wheel is accelerated uniformly from rest and rotates through 5 rad in the first second. The angle rotated by the fly wheel in the next second, will be:

Show answer and solution

Answer: (b)

  1. From rest: θ=12αt2\theta = \frac{1}{2}\alpha t^2. First second: 5=12α(1)2⇒α=105 = \frac{1}{2}\alpha (1)^2 \Rightarrow \alpha = 10 rad/s2^2
  2. In 2 s: θ=12×10×4=20\theta = \frac{1}{2} \times 10 \times 4 = 20 rad
  3. Next second: 20−5=1520 - 5 = 15 rad
  4. So the answer is (b) 15 rad.
Report a mistake

More questions on Rotational Kinematics & Dynamics