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Homework Help: Strength of material, how to know it is compressio or tension?

  1. Feb 1, 2010 #1
    1. The problem statement, all variables and given/known data
    May i know how to know boom and rod, which is in tension and compression?
    http://img7.imageshack.us/img7/5728/16203309.gif [Broken]
    http://img7.imageshack.us/img7/2595/57134603.gif [Broken]

    2. Relevant equations

    3. The attempt at a solution
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Feb 1, 2010 #2
    The answer is right in front of you. Look at the directions the forces are acting on each part.

  4. Feb 1, 2010 #3
    When you're asking for the strength do you mean the Young's Modulus because I don't see enough information to calculate stress and certainly not strain.
  5. Feb 1, 2010 #4
    This is just a force balance problem in statics. You arent required to calculate the stresses and/or strains.

    You could easily calculate the stress in the rod if you wanted to because the diameter of the rod is given.

  6. Feb 2, 2010 #5
    i know, but the question is at first comes without the second picture i had uploaded rite?
    then how can i know whether it is compression or tension with just the question(the 1st pic i uploaded)?
  7. Feb 2, 2010 #6
    Imagine the behaviour of the structure if CB is cut. What happens to the distance CB?
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