Erected a new sign welcoming people to the campus. The sign is painted on a rectangle of graphite reinforced epoxy which will not bend and measures 3 ft high and 5 ft wide. This sign is fastened along its 3 ft side to a hollow 2014-T6 aluminium (allowable shear stress = 30 ksi) pole 50 ft tall and 6 inches in diameter. On a very windy day at Dartmouth, the wind force on the sign is observed to be 5 kips. Determine the minimum wall thickness of the pole after incorporating a factor of safety of 2