A circular plate is rotating in horizontal plane, about an axis passing through its center and perpendicular to the plate, with an angular velocity \( \omega \). A person sits at the center having two dumbbells in his hands. When he stretches out his hands, the moments of inertia of the system becomes triple. If \( E \) be the initial kinetic energy of the system, then final kinetic energy will be \( \dfrac{E}{x} \). The value of \( x \) is ________.
