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Question 6197
NEET Physics · Hard

System of Particles & Rotational Motion: Rotational Dynamics Mixed MCQ

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Rotational Dynamics MixedHardQuestion 6197

Question

A flywheel (I=10 kg·m²) rotates at 120 rpm. Braking torque to stop in 10 s:
  1. A
    4π N·m
    Correct
  2. B
    2π N·m
  3. C
    12π N·m
  4. D
    π N·m

Correct answer

4π N·m

Explanation

ω₀ = 120×2π/60 = 4π rad/s. α = −4π/10 = −2π/5 rad/s². τ = Iα = 10×2π/5 = 4π N·m.

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