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Homework Help: Force vectors

  1. Sep 26, 2010 #1
    1. The problem statement, all variables and given/known data

    [PLAIN]http://img715.imageshack.us/img715/8128/66497284.jpg [Broken]

    2. Relevant equations

    3. The attempt at a solution

    I'm really confused about this question and not sure what to do. I've only been able to find the angles and don't really know what to do next. I also think that it i might need to know how to do cross products to find the expression but I'm not sure, since i haven't really learned about it yet. so i would not know when and how to apply it to this problem. If anyone can give me on how i should proceed in doing the problem in a. thanks.

    Edit:
    So i've tried to draw a perpendicular line from end of F to AB and would get something like this
    Fab = Fcos55
    i've actually thought of this before but i'm not so sure if this would be allowed, like if it's breaking any rules or somthing
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 27, 2010 #2
    Start by drawing a triangle in which the sides are parallel to AB, perpendicular to AB and F itself. What do the sides of the triangle represent? And what can you conclude from that?
     
    Last edited: Sep 27, 2010
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