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[" concrete sphere of radius "R" has a c...

[" concrete sphere of radius "R" has a cavity of radius "r" (pack with sawdust).The specific gravities of "],[" nerete and sawdust are respectively "2.4" and "0.3" .For this sphere to float with its entire volume "],[" bmerged under water,the ratio of mass of concrete to mass of sawdust will be: "],[" ) "8]

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