Chapter 6, Problem 6.45P

A thin, flat plate that is $0.2\text{m}\times 0.2\text{m}$ on a side is oriented parallel to an atmospheric airstream having a velocity of 40 m/s. The air is at a temperature of $T_{\infty }=20°\text{C,}$  while the plate is maintained at $T_s=120°\text{C}\text{.}$ The airflows over the top and bottom surfaces of the plate, and measurement of the drag force reveals a value of 0.075 N. What is the rate of heat transfer from both sides of the plate to the air?