Buckling is a problem for sheet metal used on aircraft skins and wings. traditionally the skin has been riveted to the structure; however, there are manufacturing methods that allow bonding of skin composite panels. select an aircraft: narrow-body or wide-body and if aluminum or composite skin used, discuss how this will affect the buckling mode and ultimately the service life.

Air enters a horizontal, constant-diameter heating duct operating at steady state at 290 k, 1 bar, with a volumetric flow rate of 0.25 m°/s, and exits at 325 k, 0.95 bar. the flow area is 0.04 m2. assuming the ideal gas model with k = 1.4 for the air, determine (a) the velocity at the inlet and exit, each in m/s, and (c) the rate of heat transfer, in kw flow rate, in kg/s, (b) the mass kg 0.3