Задача id10678

The shield covering the channel is located at an angle a = 45° to the horizon and is hinged to a support above the water (Fig.). Determine the force that must be applied to the cable to open the shield, if the width of the shield is b = 2 m, the depth of water in front of the shield is H1 = 2.5 m, after the shield is H2 = 1.5 m. The hinge is located above the high water level at a distance H3 = 1 m. The weight of the shield and the friction in the hinge can be neglected.

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