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Moments & equilibrium of rigid bodies

  1. Oct 21, 2012 #1
    tUmGZ.png

    The underlined red part: I don't particularly understand where they got this from?
    The yellow highlight: Why are they finding the vertical distance, instead of the perpendicular distance?
     
  2. jcsd
  3. Oct 21, 2012 #2
    The underlined red part follows from the definition of moment about a point. In the yellow part, what would the "perpendicular" distance be?
     
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