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Aflywheel of M.I. 0.32 kg m^2 isrotated ...

Aflywheel of M.I. `0.32 kg m^2` isrotated steadily at 120 rad/s by 50 W electric motor. Then the value of the frictional,couple opposing rotation is,

A

4.2 Nm

B

0.42 Nm

C

0.042 Nm

D

42 Nm

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