Atube made of an aluminum alloy with ultimate strength u = 476 mpa has a diameter of 120 mm and a thickness of 4 mm. the tube is subjected to a constant bending moment of 2 kn·m and an internal pressure that repeatedly cycles between zero and a maximum of 15 mpa. determine: (a) the cycles that can be applied before failure nf, if the material follows the fatigue relationship a =a nf m, where a = 839 mpa and m = –0.102.

Line joining liquid phase with liquid and solid phase mixture is known as: a) liquidus b) solidus c) tie line d) none of the mentioned

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.