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Bernoulli's Equation of water tower

  1. Jan 7, 2009 #1
    1. The problem statement, all variables and given/known data
    The water tower in the drawing is drained by a pipe that extends to the ground. The flow is nonviscous.


    (b) What is the absolute pressure at point 1 when the valve is opened and the water is flowing? Assume that the water speed at point 2 is negligible.

    (c) Assuming the effective cross-sectional area of the valve opening is 2.09 multiplied by 10-2 m2, find the volume flow rate at point 1.

    2. Relevant equations

    3. The attempt at a solution
    For part b:

    p1 +density(g)(y) + .5(density)(v)^2 = p2 +density(g)(y) + .5(density)(v)^2
    p1 + 0 + .5(1000)v^2 = 101000 + 1000(9.8)(15)

    I have two variables p1 and v, so how can I solve this?
  2. jcsd
  3. Jan 7, 2009 #2
  4. Jan 10, 2009 #3


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    Staff Emeritus
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    Homework Helper

    The fact that point 1 is essentially open to the atmosphere (hint, hint) dictates what the pressure is there.
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