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Pipe in network

  1. Mar 25, 2016 #1
    1. The problem statement, all variables and given/known data
    why the Q1 for AB is 5 ? for Ac is -5 , while for CB is -2 ? how to determine them ?
    I could only see Qat A = 10.0 , Q at C = 3 , Q at B = 7
    P/ s: the author take clockiwse direction to be positive , anticlockwise direction to be negative ...
    2. Relevant equations


    3. The attempt at a solution
     

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  2. jcsd
  3. Mar 26, 2016 #2
    is the author wrong ?
     
  4. Mar 27, 2016 #3
    can someone show Q1 for AB is 5 ? for Ac is -5 , while for CB is -2 ?
     
  5. Apr 10, 2016 #4
    anybody can try to answer this ? i have been waiting for the explaination too long .
     
  6. Apr 11, 2016 #5

    haruspex

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    It's a problem when you reply to your own post that other readers think you've had a reply unless they follow the link to the thread.
    It's only a trial solution. Any values could have been used that add up correctly.
     
  7. Apr 11, 2016 #6
    what do you mean by trial solution ? i'm confused.... how did the author get the Q= 5, -5 , and -2 based on 10 , 3 and 7 ?
     
  8. Apr 11, 2016 #7

    haruspex

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    I mean it is just an initial guess, consistent with the 10, 3 and 7. The method goes through an iteration to get closer to the actual solution. As an exercise, you could start with 6, -4 and -1 instead and check that you end up with the same final answer.
     
  9. Apr 11, 2016 #8
    is there any rule to choose the 3 numbers for initial guess? e.g , if i choose the first number is 15 , will it affect the second and third number that i am choosing ? or it is just guessing ?
     
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