a shaft is made with a hot rolled technique from aisi 1080 steel having a ultimate tensile strength of 770 mpa (112 kpsi) and a yield strength of 420 mpa(62 kpsi). after machining, it is polished (pulido). the reliability factor (cr) is 90% and the size of the shaft is 2 inches in diameter therefore the size correction factor (cs) is 0.82. compute the combined reliability and elongation factor (s'n). (give answer in mpa)

Air at a pressure of 1atm and a temperature of 40 c is in parallel flow over the top surface of a flat plate that is heated to a uniform temperature of 120 c. the plate has a length of 0.40m (in the flow direction) and a width of 0.15m. the reynolds number based on the plate length is 50, 000. what is the rate of heat transfer from the plate to the air? if the free stream velocity of the air is doubled and the pressure is increased to 10 atm what is the rate of heat transfer?