Design a minimum-mass support column of fixed height, h + h. the support column of height h has outer and inner diameters do and di, respectively, and uniform thickness t. the support column is treated as a cantilever beam and must withstand bending from uniform wind loads, p = 600 n/m2 on the sign of height h (neglect wind loads on the support column itself) and support the weight of the sign. in addition to the wind load, the sign itself weighs w =2.8 kn/m2.