In the previous problem, the architect is considering replacing the leeward window with a skylight on the roof, where the average pressure coefficient is estimated to be $-0\mathrm{.}5,$ but the architect wants also to include stack effect as a driving force for airflow. The skylight opening area is $0\mathrm{.}4$ m$2,$ and is to be placed at $3$ meters from the middle of the window. Assume a discharge coefficient of $0\mathrm{.}6$ for both openings. Neglect air leakage. a$.$ Estimate the airflows driven by wind: $1$ m$/$s$,3$ m$/$s$,5$ m$/$s b$.$ Estimate the airflows driven by stack effect c$.$ Estimate the combined airflows d$.$ Compare airflows with those in problem $1$