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[" 15.A cubical box is to be constructed...

[" 15.A cubical box is to be constructed with iron sheets "1m" ."],[" in thickness.What can be the minimum value of the "],[" external edge so that the cube does not sink in water "],[" Density of iron "=8000kgm^(-3)" and density of water "],[=1000kgm^(-3)" ."]

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