7075-T6 Al has a tensile yield strength of σY=450 MPa. A circular tube of 7075-T6 Al supports an axial load of 60 kN in tension and a torque of 1.0 kN-m. The average diameter of the tube is 50.0 mm. Use the von Mises yield criterion.(a)What is the safety factor against yielding if the wall thickness is 2.0 mm? (1.5)(b)What value of thickness with the same diameter would provide a safety factor of 2.0 against yielding? (2.6 mm)

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?