Given: A prestressed concrete rectangular beam $508$mm by

$762$mm has a simple span of $7\mathrm{.}315$m and is loaded by a

uniform load of $43\mathrm{.}8$ kN$/$m including its own weight. The

Prestressing tendon is located as shown and produces

and effective prestress of $1601$ kN$.$ Compute the fiber

stresses in the concrete at the midspan section.

Question: Find the Location of the Compressive force along the C$-$Line, where it coincides with the neutral axis