According to caplain, who is chiefly responsible for constantly inquiring into the nature of the ethical questions posed by the work of engineers? a)-the general public b)-government regulators c)-the engineers themselves d)- philosophers

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)