Knowing that the plate of Prob. 18.66 is initially at rest (ω = 0) when a couple of moment...

Knowing that the plate of Prob. 18.66 is initially at rest (ω = 0) when a couple of moment M0 = (0.75 ft · lb)j is applied to it, determine (a) the resulting angular acceleration of the plate, (b) the dynamic reactions A and B immediately after the couple has been applied.

Prob. 18.66

A thin, homogeneous triangular plate of weight 10 lb is welded to a light, vertical axle supported by bearings at A and B. Knowing that the plate rotates at the constant rate ω = 8 rad/s, determine the dynamic reactions at A and B.

Fig. P18.66