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Homework Help: Bernoulli's Principle(?) Problem

  1. Nov 29, 2007 #1
    1. The problem statement, all variables and given/known data
    The water supply of a building is fed through a main entrance pipe 6.0 cm in diameter. A 2.0 cm diameter faucet tap positioned 2.0 m above the main pipe fills a 25 liter container in 30 s.
    (a) What is the speed at which the water leaves the faucet.
    (b) What is the gauge pressure in the main pipe.
    Assume that the faucet is the only outlet in the system.

    2. Relevant equations
    Flow rate = A/v (cross-section area / velocity)
    Possibly(?) Bernoulli's Equation
    Possibly(?) v = [tex]\sqrt{2gh}[/tex]

    3. The attempt at a solution
    Since the flow rate would be 50 *10[tex]^{3}[/tex] m[tex]^{-3}[/tex] / 60 S, I used that, which I know, and divided it by the area [tex]\pi[/tex]0.01[tex]^{2}[/tex], and I got the right answer of 2.7 m/s.

    After that I'm lost as for what to do.
    Help please!

    Edit: Upon further analysis, I think that I need to convert this to the pressure based on the height of the column, but how would I adapt Bernoulli's equation to fit my needs?
    Last edited: Nov 29, 2007
  2. jcsd
  3. Nov 29, 2007 #2
    I didn't want to do this, but...

  4. Nov 29, 2007 #3
    I really need this problem, so here goes the underhanded tactic again.

    (not that I needed to say that, but, whatever)
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