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Question 6179
NEET Physics · Hard

System of Particles & Rotational Motion: Rotational KE Mixed MCQ

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Rotational KE MixedHardQuestion 6179

Question

A cylinder (I=1 kg·m²) rotating at 10 rad/s is brought to rest in 5 s. Average power dissipated:
  1. A
    100 W
  2. B
    10 W
    Correct
  3. C
    50 W
  4. D
    200 W

Correct answer

10 W

Explanation

The initial rotational kinetic energy is 12Iω2=12(1)(102)=50\frac12Iω^2=\frac12(1)(10^2)=50 J. Dissipating this in 5 s gives an average power of 10 W.

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