Consider an acoustic wave encountering a fat/liver interface at normal incidence. what fraction of acoustic intensity (not pressure) is reflected back from the fat/liver interface at normal incidence? (you can take the acoustic impedances of fat and liver to be 1.35 x 10^6 kg m^-2 s^-1 and 1.66 x10^6 kg m^-2 s^-1 , respectively.) does it matter from which direction the incident energy arrives? why or why not?

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.

What precautions should you take to prevent injuries when dealing with heavy loads?

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)