Water at 15°c is flowing through a 5 cm diameter smooth tube with a length of 200 m at a rate of ety0.02 kg/s. determine the pressure drop across the tube. (p 999.1 kg/m3, u- 1.138 x 10 kg/m-s) a. 11.1 pa b. 29.7 pa c or 55.3 pa c. d. 76.2 pa

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)