The uniform thin pin-connected bars AB, BC, and CD have masses mAB = 2.3 kg, mBC = 3.2 kg,...

The uniform thin pin-connected bars AB, BC, and CD have masses mAB = 2.3 kg, mBC = 3.2 kg, and mCD = 5.0 kg, respectively. In addition, R = 0.75 m, L = 1.2 m, and H = 1.55 m. When bars AB and CD are vertical, AB is rotating with angular speed ωAB = 4 rad/s in the direction shown. At this instant, the motor connected to AB starts to exert a constant torque M in the direction opposite to ωAB. If the motor stops AB after AB has rotated 90° counterclockwise, determine M and the maximum power output of the motor during the stopping phase. In the final position, ϕ = 64.36° and ψ= 29.85°.

Figure P8.46