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Question 30361
JEE Physics · Medium

Rigid Body Dynamics: JEE — Rotation Kinematics MCQ

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JEE — Rotation KinematicsMediumQuestion 30361

Question

A disc (I = 0.5 kg·m²) is accelerated from ω = 2 rad/s to ω = 10 rad/s by a constant torque in 4 s. The torque is:
  1. A
    1 N·m
    Correct
  2. B
    2 N·m
  3. C
    4 N·m
  4. D
    0.5 N·m

Correct answer

1 N·m

Explanation

α = (10−2)/4 = 2 rad/s². τ = Iα = 0.5×2 = 1 N·m.

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