Collars A and $B$ are connected by a $1\mathrm{.}4$ m long wire and can slide freely on frictionless rods. If a force $P=(400N)j$ is applied at $A,$ determine:

$($a$)$ the tension in the wire when $x=260mm$ and $y=360mm,$

$($b$)$ the magnitude of the force $Q$ required to maintain the equilibrium of the system.

Hint: Draw the FBD of each collar separately.

$T($ wire $)=kN$

$Q=$