IV. 3-D Vectors: (section 11.2) 7. The lights in an auditorium are 24-lb discs of diameter 32 inches. Each disc is supported by three equally-spaced cables that are 40 inches long. Use vectors to calculate the tension T in each cable. T9. The wrench and the applied force are in the same plane. Z Find: a). the torque vector and b). the magnitude of the torque on the bolt by the wrench if the origin is set at the center of the bolt as in the figure; also, c). describe the 28 lb 9 in. direction of motion of the bolt relative to the page. 34