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

Why can't I use the sum of force(about y axis) =0 at point P? I used this method to get the tension in the cord at first of solution, 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

Expert Solution

you can't apply sum of force(about y axis) =0 to findout Tension in the cord (T) because tension T on the given frame acts horizontally so if you apply sum of force(about y axis) =0 then only Ay and P=8KN came into the picture in that Ay acting upward and P=8kN acting on downward side so Ay=8KN

If you want to find tension in the cord then apply moment about A is zero (or) take moment about P =0 then

T(0.6)+Ay(2.25)=0

T(0.6)=8(2.25)

T=30KN

So here getting same answer only

please find the detailed solution if you have any doubt feel free to comment.

samet mamat answered 2 years ago

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