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Calculating Tension

  1. Jul 20, 2015 #1
    1. The problem statement, all variables and given/known data
    Question 33. Just T1 and T2 are okay, I know T3
    20150720_194737.jpg

    2. Relevant equations
    F=ma

    3. The attempt at a solution
    325/2 = 162.5N

    For T1: (162.5)(sin 60)

    For T2: (162.5)(sin 40)

    Thanks!
     
  2. jcsd
  3. Jul 20, 2015 #2

    SteamKing

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    Staff Emeritus
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    Homework Helper

    And you would be wrong.

    The bag is hanging in equilibrium, according to the problem statement, so not only must the sum of the forces in the vertical direction equal zero, the horizontal forces must also be equal and opposite.

    You can't blindly assume that the tension in each rope is equal, given the unequal size of the angles the ropes make with the horizontal.
     
  4. Jul 20, 2015 #3
    This is not correct. Why do you think that the weight is equally supported by the two wires?

    Chet
     
  5. Jul 20, 2015 #4
    Before solving the problem, you need to simplify the problem by using free-body diagram. And then you can realize what is wrong in your equations.
     
  6. Jul 21, 2015 #5
    thank you guys, I got the right answer.
     
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