$($a$)$

$($b$)$

A thin plate of size $40cm10cm$ is aligned parallel to a freestream with the orientations $($a$)$ and

$($b$)$ shown above. You can assume laminar boundary layer. The fluid is air at standard conditions

with velocity $U=10\frac{m}{s}.$ For each orientation, calculate:

$($a$)$ The momentum thickness $$ and displacement thickness ${}_{**}$ at the trailing edge of the plate.

$($b$)$ The drag of the plate.

$($c$)$ Provide a physical explanation for any difference in the drag of the two orientations.