Determine the force F, which should be calculated for

Determine the force F for which the locking device of the shield should be designed (see Figure 1), which rotates around the horizontal axis O and closes the hole in the side flat wall of the vessel, if there is liquid G in the vessel and the pressure gauge is attached to the upper part of the vessel, Rm. The distance from the surface of the liquid to the point O of the horizontal axis of the shield is h, the side of the cover is a, atmospheric pressure Pa = 98100 Pa.
Given: liquid-gasoline; Pm = 0.15 at = 14715 Pa; h = 600 mm = 0.6 m; a = 800 mm = 0.8 m.
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