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Homework Help: Varying pressures

  1. Dec 9, 2011 #1
    1. The problem statement, all variables and given/known data

    Giraffes have long necks, creating different pressures between their heads and hearts. Giraffes have evolved to deal with this difference. If the distance between a giraffe''s head and heart is 1.95m and its blood has a density of 1.05kg/m^3, what is the difference in pressure between the head and heart?

    2. Relevant equations

    p=dgh

    3. The attempt at a solution
    p=?
    d= 1.05kg/m^3
    h=1.95m
    p=(1.05kg/m^3)(10m/s^2)(1.95m)
    p=20.475Pa(the head)
    p=?
    d=1.05kg/m^3
    g=10m/s^2
    h=0m
    p=(1.05kg/m^3)(10m/s^2)(0m)
    p=0Pa(the heart)
    20.475Pa-0pa=20Pa
     
  2. jcsd
  3. Dec 9, 2011 #2
    Yes that's correct.
     
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