$8\mathrm{.}19.$

Air at $25$ C flows at a velocity of $\backslash (40\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash )$ over a square plate that is $35$ cm by $35$ cm $.$ The plate is at $80$ C $.$

$($a$)$ What is the drag force of the air on the plate?

$($b$)$ What is the convective heat transfer from the plate to the air?

$($c$)$ For the result of Part $($b$),$ how much heat transfer is from the laminar region and how much from the turbulent region?