1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculating linear expansion of windshield 60cm*150cm

Tags:
  1. Jul 7, 2015 #1
    1. The problem statement, all variables and given/known data
    An automobile windshield has the dimensions 60cm by 150 cm. What minimum tolerance is needed in mm to prevent the windshield from breaking if the temperature changes by 200F (the linear expansion coefficient of glass is 9*10^-6 C-1)

    2. Relevant equations
    deltaL=alpha*Li*deltaT
    T(F)=1.8*T(C)+32

    3. The attempt at a solution
    First I changes the change in temperature from F to C which resulted in deltaT=110.3C
    (one of my questions is what is an easy and direct way to convert "CHANGE in temp" from F-C. Because the way I solved it was by assuming the Tinitial was 0F and Tfinal was 200F and I converted each of these to C and then subtracted.)
    Second I used the formula once for height and once for width
    deltaL(width)=60*9*10^-6*110.3=0.06cm=0.6mm
    deltaL(height)=150*9*10^-6*110.3=0.15cm=1.5 mm

    Is this correct
     
  2. jcsd
  3. Jul 7, 2015 #2

    haruspex

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Looks ok, but most windshields are wider than they are high.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Calculating linear expansion of windshield 60cm*150cm
  1. Linear Expansion (Replies: 1)

  2. Linear Expansion (Replies: 8)

  3. Linear expansion (Replies: 6)

  4. Linear expansion (Replies: 8)

  5. Linear expansion (Replies: 8)

Loading...