Why Am I Struggling with This Math Problem?

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The discussion revolves around a math problem involving forces and beam calculations. The original poster expresses frustration over their inability to solve the problem despite multiple attempts. A contributor points out that the issue lies in the choice of the x-axis for calculations, suggesting that the horizontal axis should be maintained for clarity. Following this advice, the original poster successfully resolves the problem. The exchange highlights the importance of proper axis selection in physics problems.
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1. The problem and attempt statement, all variables and given/known data

[PLAIN]http://img31.imageshack.us/img31/2530/lastscanph.jpg



I have been at this problem for a while and i can't seem to find where i am going wrong, can someone please take a look at it.
thank you for your time.
 
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Matt1234 said:
1. The problem and attempt statement, all variables and given/known data

I have been at this problem for a while and i can't seem to find where i am going wrong, can someone please take a look at it.
thank you for your time.
Say hey, Matt, I'd like to first congratulate you on your 100th post! :approve:.

Another 20,000 more and you'll catch up to our beloved Doc Al:smile:

Your calculation for FAB is excellent. But you get into trouble when you choose the beam as the x-axis when using sum of forces in x direction = 0. Keep the x-axis as the horizontal axis. Then the weight of the beam and the weight of the load, which act vertically down, have no x components. Only the tension cable force and the R horizontal reaction force (Rx) have x components. And the x component of FAB will be ?
 
Thank you very Jay, this is a fantastic site.
I followed your suggestion, and finally got the answer. Thank you for your help :)
 

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