Homework Help: physics

Posted by Lina on Sunday, February 10, 2008 at 1:06pm.

A steel beam is used in the construction of a skyscraper. By what fraction (change in L)/(Lo) does the length of the beam increase when the temperature changes from that on a cold winter day (-15 F) to that on a summer day (+105 F)?

Can anyone please give me some hints to do it?THANKS A LOT!

physics - DrBob222, Sunday, February 10, 2008 at 1:31pm
http://en.wikipedia.org/wiki/Coefficient_of_thermal_expansion
- physics - Lina, Sunday, February 10, 2008 at 1:39pm
  but i got .00144 for the answer...
  the correct answer should be 8.0*10^-4
  how come?

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