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Force projection onto body's axis 
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#1
Sep2010, 12:09 AM

P: 6

Hey PhysicsForums. Long time reader looking for some assistance
1. The problem statement, all variables and given/known data 2. The attempt at a solution I'm pretty sure the idea is to find the unit position vector to point A, and the force vector F. I found the unit position vector to be u = (4/6)i +(4/6)j + (2/6)k, and the force to be F = (560cos60sin30)i + (560cos60cos30)j + (560sin60)k Dotting them together gives me 230 lb, but Mastering Engineering doesn't agree with me. Can anyone point out where I went awry? Thanks for reading! 


#2
Sep2010, 04:28 AM

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P: 11,683

The xcomponent of F should be negative. The rest looks fine to me.



#3
Sep2010, 08:24 AM

P: 6

Simple mistakes are embarassing :(
Thank you for your careful eyes! 


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