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Thermal Expansion question

  1. Dec 2, 2007 #1
    1. The problem statement, all variables and given/known data
    a)A steel I-beam is 30m long, and its cross-sectional area is .001 square meters. If its temperature is increased by 80C what is its change in length?

    Ysteel = 20x10^10 N/m^2
    (Alpha)steel = 1.2x10^-5/C

    b) How much force should be applied to keep it from expanding?

    2. Relevant equations
    (Delta)L = (Alpha)(Delta)T * L



    3. The attempt at a solution
    We've solved (we think) (Delta)L to be .0288.
    [(Delta)L = (1.2*10^-5)(80)(30) = .0288

    Our question is how to approach b part. We're unable to find much of anything in our notes,text, etc... related to these kinds of forces of expansion!

    We're somewhat confident about our solution to a part, though any observations on our mistakes would be appreciated!

    Thanks!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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