Water (density 1 kg/m^3) at 20 c flows at a reynolds number of 2000 inside a tube with a diameter of 3.66 cm, which is maintained at 70c. the flow velocity is 1 m/s. the heat transfer coefficient w/m^2-k for this flow is a)-500 b)-128.5 c)-50 d)-15 w/m

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)