There is a picture of a bridge that is over a body of water

A drawbridge is initially in a horizontal position and begins to rise around an axis at one end of the bridge.. The bridge has a length of L=10 m and a mass of M=1000 kg. Suppose the center of mass of the bridge is at the geometric center of the bridge. The bridge is lifted by a force F applied vertically upward at the end opposite the axis. Determine the angular acceleration of the bridge at the instant it forms an angle θ=30∘ with the horizontal.