A) a long, thin flat plate is placed parallel to a 6 m/s stream of water at 20°c. at what distancexfrom the leading edge will the boundary layer thickness be 3 cm?
(b) are low-speed, small-scaleair and water boundary layers really thin? consider flow with u= 1 ft/s past a flat plate 1 ft long. compute the boundary layer thickness at the trailing edge for (i) air and (ii) water at 68°f.

At steady state, air at 200 kpa, 325 k, and mass flow rate of 0.5 kg/s enters an insulated duct having differing inlet and exit cross-sectional areas. the inlet cross-sectional area is 6 cm2. at the duct exit, the pressure of the air is 100 kpa and the velocity is 250 m/s. neglecting potential energy effects and modeling air as an 1.008 kj/kg k, determine ideal gas with constant cp = (a) the velocity of the air at the inlet, in m/s. (b) the temperature of the air at the exit, in k. (c) the exit cross-sectional area, in cm2

The quality is zero at a)-the saturated vapour state b)-the saturated liquid state c)-the saturated liquid-vapour mixture state d)-none of the states in the other answers

Technician a says that in a worm gear steering system, most excessive steering free play is usually found in the gearbox. technician b says that in a rack-and-pinion steering system, excessive free play can be found in the bushings. who is correct?