Physics - Heat & Thermo Question with Solution | TestHub

Statement I: A steel rod resting freely on a smooth table and heated uniformly by 50°C develops no thermal stress. Statement II: The same rod, rigidly clamped at both ends with $Y=2\times 10^{11}\mathrm{N}/{\mathrm{m}}^2$ and $\alpha =1.2\times 10^{-5}$ per ${}^{\circ }\mathrm{C}$, develops a compressive stress of $1.2\times 10^8\mathrm{N}/{\mathrm{m}}^2$ for the same heating.