always MEDAL - Vectors - tension force in wire AB...
http://www.yourotherteacher.com/download.php?fID=3868&name=3d80fc8790ab8.pdf

Question

adamaero · Answer

I think it's 439 lb?

adamaero · Answer

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thomas5267 · Answer

439 lb looks right but I am not sure.

adamaero · Answer

Yep, I submitted that answer. It was correct, but not entirely sure how to get there.

thomas5267 · Answer

The way I did it is first find the scaling factor such that c|AB|=500.  Then project AB onto AC.  Finally, find the magnitude of the projection and multiply by the scaling factor.

thomas5267 · Answer

BTW, the note on the bottom of the page is absolutely obnoxious.  I get to choose how to do the math and you must give me marks if my answer is correct.