hey all. I'm having problems with what should be a simple statics problem.(adsbygoogle = window.adsbygoogle || []).push({});

"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 paralell 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

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# Homework Help: Statics problem

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