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Homework Help: Mass suspended by 3 ropes (midterm practice)

  1. Oct 9, 2011 #1
    A 100kg mass is supended by 3 ropes. one rope is attached at a point 1m[itex]\hat{x}[/itex] + 1m[itex]\hat{y}[/itex], one is attached at 1m[itex]\hat{x}[/itex] - 1m[itex]\hat{y}[/itex] and one is attached at -4m[itex]\hat{x}[/itex]. The three ropes all connect at -1m[itex]\hat{z}[/itex], at which point the mass is attached. What is the tension T in the rope attached at -4m[itex]\hat{x}[/itex]?

    I found this problem in my midterm study sheet, but I have no idea how to solve it.
    I only know the answer is supposed to be 810N but I dont understand how to get there. Thanks
  2. jcsd
  3. Oct 9, 2011 #2


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    Homework Helper

    First draw a picture, then construct the free-body diagram.

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