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Thermal expansion bt. steel rule and vycor glass brick 
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#1
Dec1010, 05:12 PM

P: 10

1. The problem statement, all variables and given/known data
A steel rule is calibrated for meauring lengths at 20.00 C. The rule is used to mesure the lenght of a Vycor glass brick; when both are at 20.00 C the length is 25.00cm. What is the length of both the rule and the brick when at 80.00 C 2. Relevant equations coef of glass a=.75 *10^6K coef of steel a=12*10^6 K 3. The attempt at a solution.75*10^6K *60.0 (the diff of Temp)*25.0 (L inital) after this I am confused 


#2
Dec1010, 05:43 PM

Mentor
P: 40,639

http://en.wikipedia.org/wiki/Thermal_expansion And to your question, how do you apply a linear coefficient of expansion to calculate the change in length? 


#3
Dec1010, 06:08 PM

P: 10

I was using the books list. So should I still use the Coeffient for glass even though the problem says to assume that the glass doesn't expand in this problem.What is the proper way to set up my formula and coeff ? Can you show me another way?



#4
Dec1010, 06:20 PM

Mentor
P: 40,639

Thermal expansion bt. steel rule and vycor glass brick
And as for how to use the coefficients to calculate the change in length, surely your book has examples on how to do it...? 


#5
Dec1010, 06:22 PM

P: 10

a is linear coeffient and B is volume expansion coeffiecient.



#6
Dec1010, 06:25 PM

P: 10

No, there aren't many examples in the book on this . The question i asked is asked completely by my second response. Sorry about that.



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