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Static Fluid question

  1. May 11, 2014 #1
    1. The problem statement, all variables and given/known data

    One hundred millilitres of water is poured into a U-tube that has a cross-sectional area of 1 cm2. Then 100 millilitres of oil, with a density 80% that of water, is poured down one side of the U-tube so that the oil floats on the water. Find the difference in height of the liquid surfaces on the two sides of the U-tube.

    2. Relevant equations
    P=gph


    3. The attempt at a solution
    Just struggling to get started, i know that on either side that at a certain point the pressures are equal.
    Just a pointer to get going would be great..
     
  2. jcsd
  3. May 11, 2014 #2
    Match them up at the bottom of the U.

    Chet
     
  4. May 11, 2014 #3
    in my sketch, i have Pa = LHS p(oil)gh = RHS p(water)gL .. g cancels our but i have two unknowns..which is the different heights of each column?
     
  5. May 12, 2014 #4
    If h is the height of the oil above the oil-water interface, and L is the height of the water above the oil-water interface, the h = 100 cm.

    Chet
     
  6. May 12, 2014 #5
    ah okay, thank you chet
     
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