Rotational Motion Question 96

Question: A solid cylinder of mass 2 kg and radius 4 cm is rotating about its axis at the rate of 3 rpm. The torque required to stop after 2π revolutions is-

Options:

A) 12×104Nm

B) 2×106Nm

C) 2×106Nm

D) 2×103Nm

Show Answer

Answer:

Correct Answer: C

Solution:

  • [c] ω22=ω12+2αθ

    0=(2π360)22×2π(2π)α

    α=960×60×2=1800

    τ=Iα=mr22α

    2×16×1042×1800=2×106



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