# Solid rigid equilibrium problem

1. Nov 8, 2009

### rAz:DD

1. The problem statement, all variables and given/known data
Hi. Given a homogeneous bar of gravity G,the length AB = 2L, resting without friction on
the two inclined planes with the angles alpha and beta to the horizontal, as shown in the following figure:
http://img44.imageshack.us/i/pic01ns.jpg/

Is is demanded:
1) The tetha angle for the equilibrium
2) The two reactions from the rests A and B (NA and NB)

2. Relevant equations
Sum Fix=0;
Sum Fiy=0;
Sum MiO=0;

3. The attempt at a solution
I've chosen X axis the line containing the bar, and the Y axis the line perpendicular to the line; O(0,0) represents the intersection of the axis in the middle of the bar.NA and NB are both on the Y axis, the moment (torque) of G is 0 , moment of NA and NB are both (2L/2)*force.

I can't identify the angles for the projections of G on the two axis. I don't need the full solution, just the projections of G, and , maybe, a hint if i did something wrong before this step.