The assembly shown has a mass of 6 kg and consists of 4 thin 400-mmdiameter semicircular aluminum plates welded to a light 1-m-long shaft AB. The assembly is at rest (ω = 0) at time t = 0 when a couple M0 is applied to it as shown, causing the assembly to complete one full revolution in 2 s. Determine

(a) The couple M0,

(b) The dynamic reactions at A and B at t = 0.

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