A uniform horizontal lever of length 4.8 m pivoted at its mid-point is in equilibrium. The following forces are acting on the lever: an unknown upward force (force with upward vertical component) that makes an angle of 40 deg with the horizontal-left acting at the right end of the lever, a 5 N vertically upward force acting at the left end of the lever, and an and a 3 N vertically downward force acting at a point on the lever 0.4 m away from the right end. Calculate the magnitude of the unknown force.