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Find the moment about the and axis

  1. Sep 12, 2012 #1
    1. The problem statement, all variables and given/known data
    http://session.masteringengineering....bs._454_55.jpg [Broken]
    Find the moment about the axis AC. F=<7,12,-6>


    2. Relevant equations
    MomentAC = Uac dotted with (Rab X F)
    Uac is the unit vector from a to c


    3. The attempt at a solution
    Uac=<.8,.6,0>
    Rab=<4,3,-2>
    F=<7,12,-6>
    Rab X F =<6,-10,0>
    MomentAC=4.8-6
    =-1.2
    MomentAC*Uac=<-.96,-.72,0>
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Sep 12, 2012 #2
    The link to the picture is garbage.
     
  4. Sep 12, 2012 #3
  5. Sep 12, 2012 #4
    How did you compute Rab x F? I get a different result.
     
  6. Sep 12, 2012 #5
    (-6(3)-(-2)12)-(-6(4)-7(-2))+(7(12)-7(3))
    (-18+24)-(-24+14)+(48-21)
    6,10,27
     
  7. Sep 12, 2012 #6
    This is different fro what you had before, and this is what I get as well. You just need to do the scalar product now.
     
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