Air is heated in a 1-meter-long, 4 mm by 16 mm rectangular duct. the air inlet temperature is 27 °c and the air mass flow rate is 0.0003 kg/s. a uniform heat flux of 600 w/m^2 is imposed on the duct surface. determine the average temperature of the air and the surface temperature of the duct at the duct exit.

Wiy doeres rere okhn a pump whon working betwon the same pressure range?

Asteel wire of 2 mm diameter is fixed between two points located 2 m apart. the tensile force in the wire is 250n, if its density of steel is given by 7830 kg/m3 the fundamental frequency of vibration hz? ?

On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)