• A lifeboat hangs from two davits, as shown in the figure. A bolt of diameter d = 0.80 in passes through each davit, and supports two pulleys, one on each side of the davit. Cables fixed to the boat pass through the pulleys and are wound on winches that raise and lower the boat. The lower parts of the cables are vertical, and the upper parts form an angle = 15° with the horizontal. The allowable tensile force in each cable is 1,800 lb and the allowable shear stress in the pins is 4,000 lb/in2. If the lifeboat weighs 1,500 lb, what is the maximum weight that should be allowed on the boat?