Consider a laminar boundary layer formed by air flowing over a flat plate at a free-stream velocity of 2 m/s. suppose at a certain streamwise location the local streamwisevelocity is measured to be 1.7 m/s at a height of 2 mm above the plate. assumingblasius solution applies, determine: (a) the local skin-friction coefficient () the wall shear stress (τw)(c) the friction velocity (u∗)

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.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

Inspection for bearing condition will include: (clo4) a)-color b)-smell c)-size d)-none of the above