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Tension in a cable

  1. Jun 9, 2013 #1
    1. The problem statement, all variables and given/known data
    Im having trouble understanding how to find the tension 'T' and pretty much answering the question on the .jpg file i have attached


    2. Relevant equations
    ƩFx=0, ƩFy=0, τ=r x F


    3. The attempt at a solution
    For question 17 i have:
    TLsinθ - w(l/2cosθ)-w(Lcosθ)= 0 (*because net sum of torques =0*)

    And for question 18 i have no attempts at the question haha.

    Help would be much appreciated!
     

    Attached Files:

  2. jcsd
  3. Jun 9, 2013 #2

    Doc Al

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    Staff: Mentor

    Good. That will give you the tension. What about the other conditions for equilibrium?
     
  4. Jun 9, 2013 #3
    Umm i have no idea what are the other conditions of an equilibrium are..
     
  5. Jun 9, 2013 #4

    Doc Al

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    You posted them under "Relevant Equations". :smile:
     
  6. Jun 12, 2013 #5
    Sorry for the delayed reply but i have completed number 18 but have not completed 17 (been doing other topics, anyways back this topic).

    The next part should be: (But im not sure how haha)
    3.TLsin60-3/2WLcos60 = 0
     
    Last edited: Jun 12, 2013
  7. Jun 12, 2013 #6

    Doc Al

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    Staff: Mentor

    Show your equations for ƩFx = 0 and ƩFy = 0.

    Hint: Label the force components exerted by the pivot as Px & Py. You'll solve for those components, of course.
     
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