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A block flats in water at 4^(0)C so that...

A block flats in water at `4^(0)C` so that `0.984` of its height is under water. At what temperature of water will the block just sink in water? Negleact expansion of block.
`(gamma_(R ) "for water"=2.1xx10^(-4)//^(0)C)`

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