A road sign consists of a steel post AB that has an outer diameter of 16 in., a wall thickness of 0.75 in., and a length of 25 ft. The pole BC has an outer diameter of 12 in., a wall thickness of 0.625 in., and a length of 40 ft to the center of the sign. The sign is 15 ft wide by 10 ft high and is subjected to a wind pressure of 0.2 psi. Determine the largest stresses in the vertical post AB due to the wind pressure, and draw Mohr's circle for that stress state.
