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*48.  A hot-air balloon is accelerating upward
under the influence of two forces, its weight and the buoyant force. For
simplicity, consider the weight to be only that of the hot air within the
balloon, thus ignoring the balloon fabric and the basket. The hot air inside
the balloon has a density of ρhot air = 0.93 kg/m3,
and the density of the cool air outside is ρcool
air = 1.29 kg/m3. What is the acceleration of the rising
balloon?
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