1. The problem statement, all variables and given/known data A spherically shaped balloon has a radius of 11.5 m, and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 1200 kg? Neglect the bouyant force on the cargo volume itself. 2. Relevant equations Fb = (Mhe+800kg)g 3. The attempt at a solution I used the above equation to determine the buoyant force acting on the balloon but didn't seem to work. I tried some other methods but i cant get how much it can lift. Need some explanation thanks.