5-14. The solid aluminum shaft has a diameter of 50 mm and an allowable shear stress of Tallow 6 MPa. Determine the largest torque T that can be applied to the shaft if it is also subjected to the other torsional loadings. It is required that T act in the direction shown. Also, determine the maximum shear stress within regions CD and DE. 5-29. The shaft has a diameter of 80 mm and due to fric- tion at its surface within the hole, it is subjected to a variable torque described by the function (25xe) Nm/m, where x is in meters. Determine the minimum torque To needed to overcome friction and cause it to twist. Also, determine the absolute maximum stress in the shaft. To 80 mm 1*5-64. The assembly is made of A-36 steel and consists of a solid rod 15 mm in diameter connected to the inside of a tube using a rigid disk at B. Determine the angle of twist at A. The tube has an outer diameter of 30 mm and wall thickness of 3 mm. 50 N-m 30 N-m B 0.2 m 0.3 m 2 m =(25x e) N-m/m 0.1 m Prob. 5-64