Recent content by 7Lions

Red in the picture? Did you post a picture soewhere? I'm unable to see it

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.

Figured it out, thanks :P

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.

I dot producted the force and the unit vector ac (7/10 i , 4/5 j, -2/5k) and got 46.22N

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...