3.44 An aluminum tube with the hexagonal cross section shown is 2.5 ft long and has a constant wall thickness of 0.080 in. Find (a) the largest torque that the tube can carry if the shear stress is limited to 7200 psi; and (b) the angle of twist caused by this torque. Use G = 4 x 106 psi for aluminum.

Find the corresponding curves to match formulae of boundary work (one of the curves is isothermal process).                                                    Curve A                                                  Curve B                                                  Curve C A. Wb = PVln(V2/V1) B. Wb = P (V2 -V1) C. 0