Question: A balloon filled with helium gas has an average density of Ïb = 0.25 kg/m3. The density of the air is about Ïa = 1.23 kg/m3. The volume of the balloon is Vb = 0.048 m3. The balloon is floating upward with acceleration a.
a. Express the weight of the balloon, W, in terms of Ïb and Vb.