1. The problem statement, all variables and given/known data A body is composed of two straight pins that are joined at a right angle. They have lengths α and β and the mass per unit length is ρ. When the body is balanced on a flat surface, as shown, how large is the normal force against the ground in the right point of contact? 4 options as can be seen in the picture. Picture: http://i.imgur.com/Hr1RBRF.jpg 2. Relevant equations I think it is: Moment: M=F*s Equilibrium equation 3. The attempt at a solution I begin by drawing a free body diagram and mark out all forces. The following four so far: Two upward normal forces from the ground located at each endpoint. Call them N_1 and N_2. Two downward gravitational forces, m_1g and m_2g, located at a/2 and b/2. Clearly it is not moving so the equations equilibrium and moment must therefore be zero. x-direction: No acting force y-direction:N_1+N_2=m_1g+m_2g I have computed the moment around several points but I end up nowhere. Especially not the desired result D. The fact that the sticks are joined at a right angle means that the Pythagorean Theorem can be used, hence sqrt(a^2+b^2).