The figure below shows this -walled shaft with open and closed cross-seater The outer diameter is Do =225 mm, The inner diameter is Di = 220 mm, the applied Torque is T= 121 kN/m 1 The thickness of the wall is t = 25 mm the Material shear modulus A is fo apa O closed cross section Cross-secer, O open Closs sector 4-) for the close cross sectes shaft, calculate the polar moment. of Inertia J[m"] 2) for the close calculate the torsional stiffness using standard units 3) for the abse cross-secher, calculate the maximum shear stresssini po 4) for the close cross-section, calculate the angle of twist per unit length Usiye standard unity s) for the open cross-secher, calculate the Torsional stiffness using standard unit. Ni m (6) For the open cross-sectes, calculate the maximum shear stress in MP 7) for the open cross-secten, calculate the angle of twist per unit length using standard units. compare the twist angle of oper cross-section to close cross seder or smaller ? show many times is biyer 2) compare the maximum shear stress of oper closs-section des close cross secher. How many times is biyer or smaller?