Question

Calculate the increase in length when 1000.0cm of steel wire of linear expansitivity 1.2×10-5°c is heated from 0°c to 50°c

Answer 1

$$\Delta l=l_0\alpha\Delta T\\ =1000.0\:\rm cm\times 1.2\times 10^{-5}\times 50=0.60\: cm$$