Understanding Method of Sections: Why is Fy=2T2 - 981? | WikiBooks

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The discussion revolves around the confusion regarding the equation Fy=2T2 - 981 in the context of the method of sections in statics. The user is unclear about the origin of the factor of 2 in the equation, questioning why it is not simply T2. They express difficulty in grasping the concept and seek clarification to aid in completing their homework. Other participants indicate that the equation presented is incorrect, suggesting that the user may need to review the underlying principles of the method of sections. Overall, the conversation highlights a common misunderstanding in applying the method of sections to solve static equilibrium problems.
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Okay, so I am trying to understand the method of sections so I can finish my homework. I look at http://en.wikibooks.org/wiki/Statics/Method_of_Sections" and for the life of me, I can't understand why at the bottom of the page it says Fy=0=2T2 - 981 .

Where does the factor of 2 come from? Why not just T2? I feel like I am missing something completely obvious. Sorry for the poor notation.

I am posting this here because it is not my homework problem, and there is no work for me to show. I would just appreciate an answer, so I can do my homework. I'm totally missing the bus on this concept right now...
 
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Thanks.
 

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