statics Questions

In a right angle $△ABC,$ $\angle A=90^{\circ }$ and sides $a,b,c$ are respectively, $5\text{cm},4\text{cm}$ and $3\text{cm}.$ If a force $\vec{F}$ has moments $0,9$ and $16$ in $\text{N cm}$ units respectively about vertices $A,B$ and $C,$ then magnitude of $\vec{F}$ is

Three forces $\vec{P},\vec{Q}$ and $\vec{R}$ acting along $IA,IB$ and $IC,$ where $I$ is the incentre of a $△ABC,$ are in equilibrium. Then $\vec{P}:\vec{Q}:\vec{R}$ is

With two forces acting at a point, the maximum effect is obtained when their resultant is $4\text{N}.$ If they act at right angles, then their resultant is $3\text{N}.$ Then the forces are