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Principle of Moments

  1. Jan 2, 2015 #1
    1. The problem statement, all variables and given/known data
    Calculate the tension in the rope, T, in the diagram below: http://imageshack.com/a/img905/2848/yMC01l.png [Broken]

    2. Relevant equations


    3. The attempt at a solution
    The 'beam' is a stable structure, thus the resultant forces be equal that are acting upon the beam. So,
    I calculated the the Torque from the mass as being 150N * 0.6m + 100N * 0.3m = 110 Nm, setting this equal to the Torque generated by the 'force line' from the rope, T*1.2m = 110Nm, thus T rounded to the nearest Newton is = 92N. I Felt fairly confident with this until my textbook said the tension in the rope is = to 100N. Can anybody clear this up for me and explain where I went wrong, Thanks!.
     
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Jan 2, 2015 #2

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    Check your arithmetic, that's "the usual suspect."
     
  4. Jan 2, 2015 #3
    Ah, thank you. I did not spot that mistake, sorry for wasting your time. Not a great first post on my part o:)
     
  5. Jan 2, 2015 #4

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    Do not let it ruin your day --- we've all been there.
     
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