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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Answer

A, C

Explanation

`p_(0)+rho_(1)gh_(1)=p_(0)+rho_(2)gh_(2)`
`:. h_(1)=(rho_(2)h_(2))/(rho_(1))`
`=(20xx0.9)/(1)`
`=18cm`.