Thermodynamics Part 5

Consider a rectangular sheet of solid material of length I=9‌cm and width d=4‌cm. The coefficient of linear expansion is α=3.1×10−5K−1 at room temperature and one atmospheric pressure. The mass of sheet m=0.1‌kg and the specific heat capacity CV=900Jkg−1K−1. If the amount of heat supplied to the material is 8.1×102J then change in area of the rectangular sheet is