Air at uniform U velocity flows over flat square shaped plates with different arrangements given in the figure below. (a) uses one plate, (b) uses four square plates. All plates are the same size....

Air at uniform U velocity flows over flat square shaped plates with different arrangements given in the figure below. (a) uses one plate, (b) uses four square plates. All plates are the same size. What is the friction forces ratio (Fb/Fa)? (NOTE: Assume laminar nerve layer condition throughout plate arrangements)