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Expansion of copper

  1. May 8, 2013 #1
    1. The problem statement, all variables and given/known data
    A copper rod is 40.0cm long at 22.0 Celsius. If the rod is heated to 100.0 Celsius, what is it's increase in length.


    2. Relevant equations
    Linear expansion of copper is 16.8*10^-6


    3. The attempt at a solution
    Change in Length= (length)(change in temp.)(α)
    So...
    (40.0)(78.0)(16.8*10^-6)
    =0.052 cm is the change in length?

    Please let me know if/what I did wrong here.
     
    Last edited: May 8, 2013
  2. jcsd
  3. May 8, 2013 #2
    What answer are you expecting?
     
  4. May 8, 2013 #3
    Don't know, I acctually may have not got it wrong i just wanted to make sure.
     
  5. May 8, 2013 #4
    OK. Well, if it makes you feel better, those values (assuming you give α in the usual units) and the linear expansion formula does give me the same answer. Basically, thermal expansion is a small effect, which thus mainly matters for larger things.
     
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