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Homework Help: Please help, beams

  1. Feb 4, 2013 #1
    I wouldn't normally be asking this but I'm completely lost. I'm not looking for the answers but can someone explain some of these to me? I would greatly appreciate it. I'm pulling my hair right now.

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  3. Feb 4, 2013 #2


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    "give a qualitative definition or explanation" - that is bad :/

    (1) looks wrong, unless y is used for the distance to the coordinate center (that would be weird).

    (2) is easy: Just check the equation. What happens to stress (S) if you increase/decrease I?

    (3) depends on some experiments?

    (5) can be done with the formula of (1).
  4. Feb 4, 2013 #3
    Thank you. But this class if actually algebra based so I'm not sure how to use that formula. I think it has something to do with the mass. I'm actually almost done. I think that I understand it a little but I'm stuck on question 4 now.
  5. Feb 4, 2013 #4


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    Eq. 1 is a standard representation for the moment of inertia of an area.
  6. Feb 7, 2013 #5
    For question 4, did you plot the experimental data as a graph?
  7. Feb 7, 2013 #6
    Oh no, they were so way off that I could barely do anything with them. I was supposed to getting numbers in the 10 millions, but most of my results(due to wrong marking) were in the 1000s. So that's not too good.
  8. Feb 8, 2013 #7
    That doesn't stop you from answering qu 4, which asks for a qualitative definition or description.
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