Q.1: ( \( \mathbf{2 5} \) pts.) A compression coil spring of \( \mathbf{3 . 5} \mathrm{mm} \) music wire, having an outside diameter of 22 mm , has 8 active coils. The end coils are plain and ground. Determine (a) its solid length (b) the maximum stress and (c) the maximum deflection caused by an axial static load of 270 N . (Note: \( G=80 \mathrm{GPa} \) for music wire)