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Homework Help: Hydrostatics Problem Finding h

  1. May 17, 2009 #1
    1. The problem statement, all variables and given/known data

    So this is a five part problem. I have already done the first 4 parts that involved the mess of different liquids to the left in the diagram.

    I am only concerned with finding h now, which I believe does not even require me to look at the left hand side of the diagram.

    I should be able to find it using only H1, H2, (SG)Hg, gammaL and patm

    I also labeled a point a because I believe it will be of use to me.


    2. Relevant equations

    The hydrostatic relation [itex]p=p_o+\rho g y=p_o+\gamma y[/itex]

    Can someone give me a hint? I have done tons of these before, but I am stumped for some reason on this one :redface:

    What is confusing is that i am given "heights" and not "depths." Not sure why that is effing me up so badly.
    Last edited: May 17, 2009
  2. jcsd
  3. May 17, 2009 #2


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    Hg level in left tube = H1 - h
    Hg level in right tube = H2
    Find the excess mercury level in the right hand tube.
    Excess pressure due to this level must be balanced by the excess pressure due to h level of liquid of density of γL.
  4. May 18, 2009 #3

    That look about right rl.bhat ?
  5. May 18, 2009 #4


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    It should be [H2-(H1-h)]γHg=hγL
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