# Here is this problem

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• Mar 12th 2006, 09:36 AM
jaycas21
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.
• Mar 12th 2006, 10:02 AM
ThePerfectHacker
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.
• Mar 12th 2006, 10:11 AM
CaptainBlack
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