|Sep20-10, 12:09 AM||#1|
Force projection onto body's axis
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!
|Sep20-10, 04:28 AM||#2|
The x-component of F should be negative. The rest looks fine to me.
|Sep20-10, 08:24 AM||#3|
Simple mistakes are embarassing :(
Thank you for your careful eyes!
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