Balloons are often filled with helium gas because it weighs only about oneseventh of what air weighs under identical conditions. The buoyancy force, which can be expressed as Fb = rairgVballoon, will push the balloon upward. If the balloon has a diameter of 12 m and carries two people, 85 kg each, deter mine the acceleration of the balloon when it is first released. Assume the density of air is r = 1.16 kg/m3, and neglect the weight of the ropes and the cage.

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