Rotational MotionHard

Question

The rotating rod starts from rest and acquires a rotational speed n = 600 revolution / minute in 2 seconds with constant angular acceleration. The angular acceleration of the rod is

Options

A.10 π rad/s2
B.5 π rad/s2
C.15 π rad/s2
D.None of these

Solution

ω2 = ω02 + 2αθ ; θ =× α × 4 = 2α.
and = 2 × α × 2α ⇒ α = 10π rad/s2

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