A vertical u tube of uniform inner cross section


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A vertical u tube of uniform cross section contains mercury in both sides of its arms 10 m glycine

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Your question is incomplete. A complete question is -----> a vertical u tube of uniform cross section contains mercury in both sides.a glycerine ( density 1.3 g/c.c) column of 10 cm is introduced into one arm.Oil of density 0.8 g/c.c is poured into the other arm until the oil and glycerine are in the same horizontal level; Find the length of oil column. density of mercury= 13.6g/c.c .

solution : Let length of oil column is L.

we can write ,
pressure due to oil + pressure due to mercury = pressure due to glycerine

or, \rho_{oil}gL+\rho_{Hg}g(10-L)=\rho_{gly}g10

given, density of oil = 0.8 g/cm³
density of mercury = 13.6 g/cm³
density of glycerine = 1.3 g/cm³

so, 0.8 × L + 13.6 (10 - L) = 1.3 × 10

or, 0.8L + 136 - 13.6L = 13

or, 12.8L = 123

L = 9.6 cm

hence, length of oil column = 9.6cm

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