Calculate the local skin friction coefficient and shear stress at a point 0.5 m from the leading edge of flat-plate airfoil flying at 60 m/s at a height of 6 km? First, assume that the boundary layer remain laminar. Second, assume that the boundary layer is turbulent. For the air viscosity at that altitude, use the value 1.5949·10-5 kg/(s·m).

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.

Which of the following controllers anticipates the future from the slope of errors over time? a)-proportional b)-on/off c)-integral d)-derivative.

Most leaks in reciprocating air compressors can be detected and minimized by: (clo4) a)-detecting leakage areas using ultrasonic acoustic detector. b)-tightening joints and connections c)-replacing faulty equipment d)-all of the given options