Each of the two right-angle bent rods weighs 2.80 lb and is parallel to the horizontal x-y

Question:

Each of the two right-angle bent rods weighs 2.80 lb and is parallel to the horizontal x-y plane. The rods are welded to the vertical shaft, which rotates about the z-axis with a constant angular speed N = 1200 rev/ min. Calculate the bending moment M in the shaft at its base O.