Example $5\mathrm{.}15$

The homogeneous plate shown in Fig. $5-27$a has a

mass of $100$ kg and is subjected to a force and

couple moment along its edges. If it is supported in

the horizontal plane by a roller at A$,$ a ball$-$and$-$

socket joint at B$,$ and a cord at C$,$ determine the

components of reaction at these supports.

Figure $5-27.$

Why did we include the $200$ N$.$m when we solved the moment of the y$-$axis, dosent it pass through it$?$