A high-performance automotive driveshaft is to be made of a 4-inch outer diameter 6061-T6 Aluminium tube. The shaft is to transmit 500 hp at 3000 rpm and requires a minimum factor of Safety against a shear yield failure of 3.0. Objective: Determine the minimum wall thickness of the driveshaft to the nearest 1/16th inch. Also, if the shaft is 6.0 feet in length, determine the angle of twist (in degrees) over the length of the shaft.