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a balloon of volume 3000m-3 is filled with hydrogen 0.09kgm-3. the mass of the fabric of the balloon is 100kg. calculate the greatest mass that

a balloon of volume 3000m-3 is filled with hydrogen 0.09kgm-3. the mass of the fabric of the balloon is 100kg. calculate the greatest mass that the balloon can lift in air of density 1.2kgm-3

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