$13-13.$ The illustration below shows an industrial$-$scale wind turbine that is designed for deep$-$water. ${?}^{48}$ It is

supported by three cylindrical ballast tanks that float and it is secured to the ocean floor by cable. A strong

wind gust causes two lateral loads to be placed upon the turbine tower. The concentrated load is

$F=1200kN$ and the uniform distributed load is $\frac{F}{l}=200\frac{N}{m}.$ Let the tower be cylindrical with an outside

diameter of $6\mathrm{.}29m.$ Draw shear and bending moment diagrams and identify the magnitude of forces and

moments in the diagrams. Suppose the tower is made of A$36$ steel with a thickness of $t.$ Using a design

factor of $4$ where ${}_d=\frac{{}_y}{N},$ determine the proper thickness, $t,$ based upon the bending stress. Omit the

weight of the components. Assume its connections to the base and nacelle are very strong and the base is

stationary.