A flywheel (I = 3 kg m^2) is brought from rest to 12 rad/s in 4 s. The torque needed is:

  1. 18 N m
  2. 9 N m
  3. 4.5 N m
  4. 10 N m
Answer

B) 9 N m

alpha = 3 rad/s^2; tau = Ialpha = 9 N m. SLO P-11-B-19 · Application

Physics MCQ · More Circular and Rotational Motion MCQs · Practise