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2-76 Balloons are often filled with helium gas because it weighs only about one-seventh of what air weighs under identical conditions. The buoyancy force, which can be expressed as F,

= PairgVbaloon will push the balloon upward. If the balloon has a diameter of 12 m and carries two people, 85 kg each, determine the acceleration of the balloon when it is first released. Assume the density of air is p 1.16 kg/m, and neglect the weight of the ropes and the cage. Answer: 22.4 m/s2

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