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Heat Flowing Through A Sectioned Rod! HELP!

  1. May 8, 2008 #1
    1. The problem statement, all variables and given/known data

    A long rod, insulated to prevent heat loss along its sides, is in perfect thermal contact with boiling water (at atmospheric pressure) at one end and with an ice-water mixture at the other. The rod consists of a 1.00 section of copper (with one end in the boiling water) joined end-to-end to a length of steel (with one end in the ice water). Both sections of the rod have cross-sectional areas of 4.00 . The temperature of the copper-steel junction is 65.0 after a steady state has been reached.
    How much heat per second flows from the boiling water to the ice-water mixture?
    Express your answer in watts

    2. Relevant equations

    H=kAdT/L
    kcopper=385
    ksteel=50.2

    3. The attempt at a solution

    Hcopper=Hsteel
    Hcopper=385*0.04^2*35
    = 21.56W
    There's something wrong with this answer.. Can someone please help me?
    Thank you!!
     
  2. jcsd
  3. May 8, 2008 #2

    alphysicist

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    Homework Helper

    Hi tizzful,

    In your expression you have squared 0.04 (which is (area/length) in meters); since they gave the area I don't believe that number should be squared.
     
  4. May 9, 2008 #3
    Hello, yes I realized afterwards that its in cm squared and I need it in meters squared and therefore had to multiply it by 10^-4. Thank you
     
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