A rod (mass m1 = 1 kg, length 2 m) of uniform cross section sticks out perpendicularly from a vertical wall at point A. A mass (m2 = 2 kg) hangs from a string connected to the middle of the rod. A wire connects the opposite end of the rod B to a point C, which is 1 m directly above A. (See figure.) (Use g = 10 m/s2.)
What is the horizontal force exerted by the wall on the rod?