Question: A balloon filled with helium gas has an average density of b = 0 . 3 9 kg / m 3 . The density of

A balloon filled with helium gas has an average density of b =0.39 kg/m3. The density of the air is about a=1.23 kg/m3. The volume of the balloon is Vb =0.027 m3. The balloon floats upward with acceleration a.

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