Recent content by cursive

I guess I got so caught up in formula's 'n such that I forgot what was really going on. Thank you both!

I have uploaded the question with solution at this address: http://i41.tinypic.com/o5xm5j.jpg All I need to know is why in the moment equation "NA*a - F*b = 0" the forces Nb and Nc aren't included. Is it because the moment is being calculated about the dot in the middle, and the other two...