An empty balloon and its equipment weigh 100 Ib. When inflated with gas weighing 0.0345 lb/ft3 the balloon is spherical and 20 ft in diameter. What is the maximum weight of cargo that the balloon can lift, assuming that air weighs 0.0765 lb/ft 3 ? A solid wood cylinder has a diameter of 2.0 ft and a height of 4.0 ft. The specific gravity of the wood is 0.60. If the cylinder is placed vertically in oil (sp gr = 0.85), will it be stable?
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