Question

A railway track that is 50 m long, with initial temperature of 10 °C is subjected to a great heat. How much will it expand when its temperature is tripled [α= 13 ´ 10^-6 / °C]?

Answer 1

$\Delta L=\alpha L \Delta T=13\cdot10^{-6}\cdot50\cdot20=0.013\ (m)=1.3\ (cm)$ . Answer