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Homework Help: Sheer Deformation of a Book

  1. Apr 28, 2009 #1
    1. The problem statement, all variables and given/known data

    A large book has forces of magnitude 14 N applied in opposite directions to two opposite faces of area 42 cm2. The thickness of the book (L) is 2.0 cm. The deformation angle (g) is 8.4°.

    1) what is change in X?
    2) What is young's modulus for the book?

    http://dl.getdropbox.com/u/119186/Picture%201.png [Broken]

    2. Relevant equations

    I tried getting change in x doing 2cos(8.4) but I'm horrible at trig. What should I have done?

    Once I do that, I can just plug it all into F/A = S*deltaX/L

    What should I be doing to get the change in X?
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Apr 28, 2009 #2
    And I should have just used SIN!

    Can someone explain to me why I needed to use SIN over COS in this example? I just don't get it.

    What does SIN or COS intrinsically mean, represent, etc?
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