(a) Show that when a frame supports a pulley at A, an equivalent loading of the frame and of each of its component parts can be obtained by removing the pulley and applying at A two forces equal and parallel to the forces that the cable exerted on the pulley.

(b) Show that if one end of the cable is attached to the frame at point B, a force of magnitude equal to the tension in the cable should also be applied at B.

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