Solve the following problem:
Q: Asphalt pavement may achieve temperatures as high as 50°C on a hot summer day. Assume that such a temperature exists throughout the pavement, when suddenly a rainstorm reduces the surface temperature to 20°C. Calculate the total amount of energy (J/m2) that will be transferred from the asphalt over a 30-min period in which the surface is maintained at 20°C.