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Homework Help: Solid rigid equilibrium problem

  1. Nov 8, 2009 #1
    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:

    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.

    Looking forward for any reply.
  2. jcsd
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