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## Homework Statement

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.

## Homework Equations

Fb = (Mhe+800kg)g

## 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.