The shaft of Prob. 18.68 is initially at rest (ω = 0) when a couple M0 is applied to it. K...

The shaft of Prob. 18.68 is initially at rest (ω = 0) when a couple M0 is applied to it. Knowing that the resulting angular acceleration of the shaft is α = (20 rad/s2)i, determine (a) the couple M0, (b) the dynamic reactions at A and B immediately after the couple is applied.

Prob. 18.68

The 8-kg shaft shown has a uniform cross section. Knowing that the shaft rotates at the constant rate ω = 12 rad/s, determine the dynamic reactions at A and B.

Fig. 18.68