Physics

Problem

A square aluminium plate has each side equal to

20\,\text{cm}

20^{\circ}\text{C}

. If the temperature is raised to

100^{\circ}\text{C}

and the coefficient of superficial expansion of aluminium is

\beta = 4.4 \times 10^{-5}\,^{\circ}\text{C}^{-1}

, calculate the increase in its area, expressing your answer in

\text{cm}^2