For a beam AB resting against a smooth wall with a ball-and-socket joint at A and a cable CD running from the midpoint D to A at an angle, the document calculates the tension in the cable, the reactions at supports A and B, and the horizontal reaction at A. It finds that the tension in cable CD is 3205N, the reaction at B is 1000N, the reaction at A is 1500N, and the horizontal reaction at A is 2019N.