Technician A says in a semi-independent rear suspension system, improper rear wheel toe and tracking may be caused by a bent trailing arm. Technician B says on a semi-independent rear suspension system, improper rear wheel toe and tracking may be caused by a bent inverted U-channel. Who is correct

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)