A lifeboat hangs from two ship's davits, as shown in the figure. A pin of diameter d = 0.80 in. passes through each davit and supports two pulleys, one on each side of the davit.
Cables attached to the lifeboat pass over the pulleys and wind around winches that raise and lower the lifeboat. The lower parts of the cables are vertical and the upper parts make an angle α = 15° with the horizontal. The allowable tensile force in each cable is 1800 lb, and the allowable shear stress in the pins is 4000 psi.
If the lifeboat weighs 1500 lb, what is the maximum weight that should be carried in the lifeboat?

Transcribed Image Text:

Davit α= 15° Pulley Pin Cable