An airplane flies at a speed of 507 mph at an altitude of 10,000 ft. If the boundary layers on the wing surfaces behave as those on a flat plate,

(a) estimate the extent of laminar boundary layer flow along the wing. Assume a transitional Reynolds number of Rexcr=5 × 105. If the airplane maintains its 539 -mph speed but descends to sea-level elevation,
(b) estimate the extent of the laminar boundary layer flow.
(c) Will the portion of the wing covered by a laminar boundary layer increase or decrease compared with its value at 10,000 ft?

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.