- #1
LeftBrain
- 3
- 0
Homework Statement
A (0,0,0)
B(5,6,1)
C(3,0,4)
|F|= 1919N
Homework Equations
The Attempt at a Solution
Cartesian:
B= {5i + 6j + 1k}
C= {3i + 4k}
rCB ={2i + 6j - 3k}
|rCB| = sqrt(22 + 62 + 32) = 7
Unit vector = rCB / |rCB| = {2/7i + 6/7j - 3/7k}
F = |F| * Unit vector = 1919 {2/7i + 6/7j - 3/7k} = 548.29i + 1644.86j - 822.43k
Now firstly, I'm not sure if I even did the above part correctly, but to find the moment I'm a bit lost and my don't seem to have much in my notes about this...
I think the next step is using cross product, but I'm a bit lost as to which arm to take to find moment about A...
If I use rBA I get:
MA = rBA x F = 6579.44i - 4660.44j - 4934.56k
WELP! Need help!
Cheers LB