$-6.[20$ points$]$ A step$-$in viewing window having the shape of a half$-$cylinder, which

is built into the side of a large aquarium, as shown in the figure below. A civil

engineer needs to know the applied hydrostatic forces on the window to select proper

construction materials. Use the fluid mechanics knowledge you learned to help the

engineer $[$Hint: check Table B$.2$ for water properties at $20C.]$

$($a$)$ find the magnitude, direction, and location of the net horizontal hydrostatic force

on the viewing window.

$($b$)$ find the magnitude and direction of the net vertical hydrostatic force on the re$-$

viewing window.