. A thin rod of negligible mass and area of cross-section 4 x 10^-6 m^2
A thin rod of negligible mass and area of cross-section 4 × 10–6 m2, suspended vertically from one end, has a length of 0.5 m at 100 °C.
The rod is cooled to 0°C, but prevented from contracting by attaching a mass at the lower end. Find (i) this mass and (ii) the energy stored in the rod, given for the rod. Young’s modulus = 1011 N/m2. Coefficient of linear expansion 10–5 K–1 and g = 10 m/s2