- #1
akhmed966
- 12
- 0
http://img10.imageshack.us/img10/8880/capturejfu.jpg
I did arctan(12/5) to get the degrees + 180 to get the angle from the X axis to B, then I just split the angles into components.
I did 100*cos(246) + 100*cos(theta) = 0, and I got 67 degrees.
Then I was doing the Y components, and realized they were equal and opposite, so it would equal 0, which the weight can't be equal to.
So I looked at the solution, and here how the answer is found.
Sum of X: 100cos(theta) = Wa(5/13)
Sum of Y: 100sin(theta) = Wa(12/13)+Wa
Why is the answer figured like this, and when do I do it differently from sum of the components? I'm totally lost, but I have a slight idea.
Thanks.
I did arctan(12/5) to get the degrees + 180 to get the angle from the X axis to B, then I just split the angles into components.
I did 100*cos(246) + 100*cos(theta) = 0, and I got 67 degrees.
Then I was doing the Y components, and realized they were equal and opposite, so it would equal 0, which the weight can't be equal to.
So I looked at the solution, and here how the answer is found.
Sum of X: 100cos(theta) = Wa(5/13)
Sum of Y: 100sin(theta) = Wa(12/13)+Wa
Why is the answer figured like this, and when do I do it differently from sum of the components? I'm totally lost, but I have a slight idea.
Thanks.
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