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Homework Help: Bernoulli Equation Problem

  1. Feb 11, 2015 #1


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    Hey everyone ! I'm new here and found that this forum was very useful. Would really appreciate it if you could help me out with this problem ! Have been scratching my head for hours now :(

    Thank you very very much once again !

    Attached Files:

  2. jcsd
  3. Feb 11, 2015 #2
    The (a) part can be solved by conserving volume of the liquid . (Think about rate of change of volume !!)
  4. Feb 11, 2015 #3


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    heya, A was okay actually. The main problems I have are with B onwards !

    Thank you for your viewership :)
  5. Feb 12, 2015 #4


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    Okay, so I was told that my homework request was an unreasonable one and hence, I have looked through the forum rules. I shall abide by them ! So sorry for being ignorant.

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

    2. Relevant equations
    Bernoulli Equation: V2/2g + p/dg + z = constant
    V = velocity of particles flowing through that point of the streamline
    g = acceleration due to gravity
    p = pressure at that point of the streamline
    d = density
    z = elevation at that point of the streamline

    3. The attempt at a solution

    (a) V = H0B = bh + (B-b)H

    (b) By conservation of volume,
    Discharge, Q = W.Ab = Ub.Af
    Q = W.b = Ub.h

    Therefore, Ub = bW/h

    (c) Since gap-averaged flow from x=0 to x=b is a well-behaved flow, dU(x)/dx = 0

    At point x=b: Ub/2g + dg(H-h)/dg + h = constant

    From here, I'm really not too sure how to proceed.

    Any help would be greatly appreciated ! Thank you !
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