Homework Statement
The Attempt at a Solution
I'm having trouble understanding how r1 = -1.5j and r2= r3 = 0.
Can anyone make this a little clearer for me? I've spent quite a while trying to wrap my head around it but to no avail.
Homework Statement
The Attempt at a Solution
I understand 90% of the problem and how to do it, I just can't wrap my head around how they managed to get 0.3sin30 for that one side in the problem.
Not only are the values incorrect but the signs are as well Chet.
Following through with the calculation using C-A (-7,-6, +4) I end up with : {-20.895i + 26.866j + 19.9007k}
which is a ways off from the ( -18.0i -15.4j + 10.3k) answer.
A-C Yields (+, -, -) values
Hey Chet, thanks for the reply.
Yea I do. The coordinates for point C are { 7i + 6j -4k}
I've tried applying the dot product of point C's coordinates to the force but didn't come to the correct answers.
My work:
Fca = F {30i -45k +50k} * Uca ({7i +6j -4k}/ Sqrt(7^2 + 6^2 +4^2))
Doesnt...
Appreciate the quick reply Simon, I see AB's triangle but I'm having trouble finding a relation between AB and AC.
The answer at the back of the book yields Fac = -25.87 lb ( -18.0i -15.4j + 10.3k)
I don't really understand how they can come up with an answer that has i and j being negative...
Homework Statement
Determine the magnitude of the projected component of F along AC. Express this component as a Cartesian vector.Homework Equations
Information I'm working with. The Attempt at a Solution
Most of my attempts have proven fruitless.
I understand that in order to find a...