Consider the NACA2418 airfoil. a) Given that the Reynolds number is Re= 5.9 E6 with standard roughness, find the angle of attack that leads to a drag coefficient of 0.016. b) At what value of the angle of attack are the values of parasite drag and induced drag the same? Take AR = 7, load factor n=1, efficiency factor e = 0.95, and wing loading of 100 lb/ft^2.

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.

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?