Question:
A load of $10 \mathrm{~kg}$ is suspended by a metal wire $3 \mathrm{~m}$ long and having a cross-sectional area $4 \mathrm{~mm}^{2}$. Find (a) the stress (b) the strain and (c) the elongation. Young's modulus of the metal is $2.0 \times 10^{11} \mathrm{~N} / \mathrm{m}^{2}$.
Solution:
