$($Maximum $10$ points$)$ Answer the following:

$($a$)(5$ points$)$ A symmetric parabolic three$-$hinged arch is loaded by a uniformly distributed load

along its whole span. Show that the bending moment at any location within the arch is zero.

$($b$)(5$ points$)$ Consider the cable AB shown in figure $3($left$).$ Analyzing this cable as the one which

is subjected to uniformly distributed load, find the maximum tension in the cable.

Figure $3$: $($Left$)$ Structure for Question