this course, you will be required to design a highway sign consisting of a vertical steel post $20$ ft long, which is a hollow pipe of $8$ in$.$ outer and $7$ in$.$ inner radii. The sign also consists of two horizontal arms $21$ ft long and hollow pipes $1$ in$.$ thick supporting two rectangular boards $6$ ft wide by h$-$ft height as shown. The boards are to be designed to resist wind pressure of between $2060$ lb$./$ft$2.$ Use the maximum shear stress theory and find the size of the height of the board and the approximate value of the diameter of the horizontal pipes. Consider steel material for the boards with E $=30$x$10^6$ psi and sigma$\_$yp $=31\mathrm{.}2$X$10^3$ psi