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Hardy Cross problem

  1. May 12, 2016 #1
    1. The problem statement, all variables and given/known data
    in this problem , we know that Q (flow rate ) has power of 2 , hf = k(Q^2) , shouldnt the hf = k(Q^2) has positive value ?

    2. Relevant equations


    3. The attempt at a solution
    since (554)(-40^2) will become positive , same thing goes to hf / Q , when the hf = positive , the hf / Q will become hf / Q divided by Q(has negative value ) , so the hf / Q will have negative value , am i right ?
     

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  2. jcsd
  3. May 12, 2016 #2
    why will (554)(-40^2) will become negative ?
     
  4. May 12, 2016 #3
    anybody can answer ?
     
  5. May 14, 2016 #4
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