- #1
ebinesos
- 1
- 0
hey all. I'm having problems with what should be a simple statics problem.
"The Magnitude of force F is 80.0 N. What are the madnitude of its components a) F\ab and b) F\ac that are parallel to the bars AB and AC respectively."
The picture: Force F pointing straight down. bar AB pointing 30 left of straight up (NW), and and bar AC pointing 70 degrees left of straight up (NW also).
I know i need to use the dot product somehwhere, but I can't determine what i need to do it with respect to. But I did rotate the problem 90 degrees CCW, and had the resulting equation:
|80*F\ac|cos110 + |80*F\ab|cos150=0
additional question: will F\ab + F\ac = 80. When adding up all those forces this problem doesn't seem to be in static equallibrium...
Thanks
"The Magnitude of force F is 80.0 N. What are the madnitude of its components a) F\ab and b) F\ac that are parallel to the bars AB and AC respectively."
The picture: Force F pointing straight down. bar AB pointing 30 left of straight up (NW), and and bar AC pointing 70 degrees left of straight up (NW also).
I know i need to use the dot product somehwhere, but I can't determine what i need to do it with respect to. But I did rotate the problem 90 degrees CCW, and had the resulting equation:
|80*F\ac|cos110 + |80*F\ab|cos150=0
additional question: will F\ab + F\ac = 80. When adding up all those forces this problem doesn't seem to be in static equallibrium...
Thanks