An aircraft is flying at sea level with a velocity of 260 m/s, if we consider its wing as a rectangular flat plate of span 10.0m and chord 2.0m, calculate the boundary layer thickness at the wing trailing edge and total skin friction drag for: (density = 1.225 kg/m3, dynamic viscosity = 1.8 x 10-5 kg/ms, assume that the flow is incompressible). (i) completely laminar flow (ii) completely turbulent flow

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.

Acircular aluminum shaft mounted in a journal is shown. the symmetric clearance gap between the shaft and journal is filled with sae 10w-30 oil at t 30°c. the shaft is caused to turn by the attached mass and cord. develop and solve a differential equation for the angular speed of the shaft as a function of time.

A21-tooth spur pinion mates with a 28-tooth gear. the diametral pitch is 3 teeth/in and the pressure angle is 20°, find the following values: the addendum, dedendum, circular pitch, tooth thickness, and base circle diameters.