A slider-crank mechanism has a slider of mass of 10 kg and stroke of 0.2 m and rotates with a uniform angular velocity of 10 rad/s. The primary internal force is partially balanced by a revaluing mass of 6 kg at the crank placed at a distance equal to the crank radius. Neglecting the mass of connecting rod and crank. When the crank angle is 30°, find the magnitude of unbalance force in N [up to 2 decimals]