The three small spheres are welded to the light rigid frame which is rotating in a horizontal plane about a vertical axis through O with an angular velocity θ˙ = 20 rad/s. If a couple M_O = 30 N∙m is applied to the frame for 5 seconds, compute the new angular velocity θ˙′.

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3 kg 0.5 m 0.4 m YMo = 30 N-m 4 kg 0.6 m 3 kg