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Fluid Dynamics Question: A glass tube areas, pressure, determine height.

  1. Dec 7, 2009 #1
    The above is a link to the problem - Question #3.

    1. The problem statement, all variables and given/known data

    A glass tube has several different cross-sectional areas with the values indicated in the figure. A piston at the left end of the tube exerts pressure so that the mercury within the tube flows from the right end with a speed of 8.0 m/s. Three points within the tube are labeled A, B, and C.
    Point A 12cm^2
    Point B 5.6cm^2
    Point C 6.0cm^2
    NB: The drawing is not to scale.
    Atmospheric pressure is 1.01×105 m/s2; and the density of mercury is 13 600 kg/m3.
    Determine the height h of mercury in the manometer with the evacuated upper end.
    (a) 136 mm (b) 269 mm (c) 276 mm (d) 366 mm (e) 371 mm

    2. Relevant equations

    I really don't know where to start with this question, so any help would be appreciated here.

    Atmospheric pressure is 1.01×105 m/s2
    density of mercury is 13 600 kg/m3

    Pressure = force / area, p = F/A

    3. The attempt at a solution

    As above, not really sure where to start with this as I missed our week of learning about fluid dynamics and am now playing greaaat catch up. Would greatly appreciate the help!
    Last edited: Dec 7, 2009
  2. jcsd
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