Why can't I use the sum of force(about y axis) =0 at point P? I used...

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Mechanical Engineering

Why can't I use the sum of force(about y axis) =0 at point P? Iused this method to get the tension in the cord at first ofsolution, but gotten wrong answer.

http://www.chegg.com/homework-help/mechanics-of-materials-8th-edition-chapter-1-problem-6p-solution-9780136022305?trackid=1b3aa2d6&strackid=4d3f9551&ii=1

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you cant apply sum of forceabout y axis 0 to findout Tensionin the cord T because tension T on the    See Answer
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