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Math Help - Here is this problem

  1. #1
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    Here is this problem

    Here is the problem I am working on and I do not know what to do next am I supposed to combine the variables, I know I isolate and divide by the one I want to find but I do not come close to any of the answers given :

    sigma FX= .667TAB -.408TAC-.514TAD = 0
    sigma FY= .667TAB -.816TAC+.686TAD-981N= 0
    sigma FZ= .333TAB - .408TAC+ 0.514TAD = 0

    Solve for each to find tensional force

    Answers given are:
    TAC= 636 N
    TAB = 519 N
    TAD = 168 N

    Can someone please help, and explain slowly and simplistically I have been struggling with this I am a complete moron.
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  2. #2
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    Quote Originally Posted by jaycas21
    Here is the problem I am working on and I do not know what to do next am I supposed to combine the variables, I know I isolate and divide by the one I want to find but I do not come close to any of the answers given :

    sigma FX= .667TAB -.408TAC-.514TAD = 0
    sigma FY= .667TAB -.816TAC+.686TAD-981N= 0
    sigma FZ= .333TAB - .408TAC+ 0.514TAD = 0

    Solve for each to find tensional force

    Answers given are:
    TAC= 636 N
    TAB = 519 N
    TAD = 168 N

    Can someone please help, and explain slowly and simplistically I have been struggling with this I am a complete moron.
    Are you doing another equilibrium problem but this time in 3 dimensions? I understand TAC,TAB,TAD as single variables.
    Then you have a system of linear equations. Just have a computer solve it for you with determinants.
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  3. #3
    Grand Panjandrum
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    Quote Originally Posted by jaycas21
    Here is the problem I am working on and I do not know what to do next am I supposed to combine the variables, I know I isolate and divide by the one I want to find but I do not come close to any of the answers given :

    sigma FX= .667TAB -.408TAC-.514TAD = 0
    sigma FY= .667TAB -.816TAC+.686TAD-981N= 0
    sigma FZ= .333TAB - .408TAC+ 0.514TAD = 0

    Solve for each to find tensional force

    Answers given are:
    TAC= 636 N
    TAB = 519 N
    TAD = 168 N

    Can someone please help, and explain slowly and simplistically I have been struggling with this I am a complete moron.
    The answer given is not a solution to the set of equations you have here.
    Just substitute the "solution" into the first equation and see if it is satisfied.

    RonL
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