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A cubical block of iron 5 cm on each sid...

A cubical block of iron 5 cm on each side is floating on mercury in a vessel. (i) what is the height of the block above mercury level ?
(ii) Water is poured in the vessel until it just covers the iron block. What is the height of water column . density of mercury `13.6 gm//cm^(3)`. Density of iron 7.2 `gm//cm^(3)`

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