Solve Prob. 4.138 assuming that the plumber exerts a force F= − (80 N)k and that the motor is turned off (M = 0). Problem 4.138: To clean the clogged drainpipe AE, a plumber disconnected both ends of the pipe and inserted a power snake through the opening at A. The cutting head of the snake is connected by a heavy cable to an electric motor which rotates at a constant speed as the plumber forces the cable into the pipe. The forces exerted by the plumber and the motor on the end of the cable can be represented by the wrench F= − (80 N)k, M = −(144 N ∙ m)k. Determine the reactions at B, C, and D caused by the cleaning operation. Assume that the reaction at each support consists of two force components perpendicular to the pipe.