A balloon filled with helium gas has an average density of ρb = 0.38 kg/m3. The density of the air is about ρa = 1.23 kg/m3. The volume of the balloon is Vb = 0.033 m3. The balloon floats upward with acceleration a.a) Express the net force F on the balloon in terms of its weight W and the buoyancy force Fb on it, assuming upward is the positive direction. F =?
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