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Homework Help: Statics problem

  1. Sep 13, 2010 #1
    1. The problem statement, all variables and given/known data

    The problem and my attempt are given

    Originally i put this in the upper level physics section, i made a mistake, it should go here.

    [PLAIN]http://img266.imageshack.us/img266/5495/lasts02can.jpg [Broken]
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Sep 14, 2010 #2


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    The direction of the resultant is given by

    tan75 = ( F3 + F2sinθ )/(F1 - F2cosθ)

    F1tan75 - F2cosθtan75 = F3 + F2sinθ

    Find F2. The condition for minimum F2 cab be found by finding d(F2)/dθ and equating it to zero. You will get the value of θ.
  4. Sep 14, 2010 #3
    So my diagram was completley off. Was there a way to achieve the solution using my method?
    Last edited: Sep 14, 2010
  5. Sep 14, 2010 #4


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    Draw all the vectors at the point of action.
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