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Water and oil are poured into the two li...

Water and oil are poured into the two limbs of a U-tube containig mercury. The interface of the mercury and the liquids are at the same height in both limbs.
Determine the height of the water column`h_(1)` if that of the oil `h_(2)=20cm`. The density of the oil is `0.9`.
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[18 cm]
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