Rotational MotionHard

Question

A wheel is rotating about an axis through its centre at 720 rpm. It is acted on by a constant torque opposing its motion for 8 second to bring it to rest finally. The value of torque in Nm is : - (given I = kg - m2)

Options

A.48
B.72
C.96
D.120

Solution

= 24π
0 = 24π - α × 8 ⇒ α = 3π
τ = Iα = × 3π = 72

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