Determine the equivalent force$-$couple system at the center $O$ for each of the three cases of forces $(F=310N)$ being applied along the edges of a square plate of side $d=580mm.$ The couple is positive if counterclockwise, negative if clockwise.

Answers:

$($a$)R=1$ i$+$ j$)N,M_O=N*m$

$($b$)$ i $+$

j$)N,M_O=N*m$

$($c$)R=1$ i$+$ i $$ j$)N,M_0=N*m$