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Thermal Expansion question

  • #1

Homework Statement


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?

Homework Equations


(Delta)L = (Alpha)(Delta)T * L



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!

Homework Statement





Homework Equations





The Attempt at a Solution

 

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