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Statement of a problem № 2649

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What must be the volume V of a 5.0-kg balloon filled with helium (rHe=0.178 kg/m3) if it is to lift a 30-kg load? Use rair = 1.29 kg/m3.

Solution:
What must be the volume V of a 5.0-kg balloon filled with helium (rHe=0.178 kg/m

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