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Homework Help: Please Help me

  1. Dec 27, 2009 #1
    1. The problem statement, all variables and given/known data

    A patient is to be given a blood transfusion. If the inside diameter of the 4.0 cm long
    needle is 0.40 mm, the blood pressure in the arm is 2400 Pa, and the required flow is 4.0
    cm³/min, how high h should the bottle be placed? (ρ = 1050 kg/m³, η =0.0040 Pa·s)

    2. Relevant equations

    I don't know how to do this question

    please help me through " Poisieulles' equation " only

    Best Wishes for you
  2. jcsd
  3. Dec 27, 2009 #2


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    Science Advisor
    Homework Helper

    Hi Dr.Wasim! :wink:

    Poiseuille's equation is change in pressure = 8ηLQ/πr4
    see http://en.wikipedia.org/wiki/Poiseuille%27s_law" [Broken] for details.

    Show us what you get. :smile:
    Last edited by a moderator: May 4, 2017
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