A hollow titanium [G = 40 GPa] shaft has an outside diameter of D = 40 mm and a wall thickness of t = 1.74 mm. The maximum shear stress in the shaft must be limited to 226 MPa. Determine: (a) the maximum power P that can be transmitted by the shaft if the rotation speed must be limited to 21 Hz. (b) the magnitude of the angle of twist @ in a 850-mm length of the shaft when 33 KW is being transmitted at 9 Hz. Answers: (a) P = KV. (b) Q =