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Overall rate of heat conduction for a fin

  1. Feb 12, 2015 #1
    1. The problem statement, all variables and given/known data
    http://postimg.org/image/4ctgrkoop/
    I don't understand the final bit, for the 'steady rate of heat transfer for the entire fin', how they went from Fourier's Law to that final expression.

    2. Relevant equations


    3. The attempt at a solution
    I think it involves the previous expression but I really don't know
     
  2. jcsd
  3. Feb 12, 2015 #2
    Do you at least understand the part of the expression involving dT/dx?

    Chet
     
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