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An inclined rectangular sluice gate AB 4m length and 2m width, its weight 5kn as shown in figure is installed to control the discharge

An inclined rectangular sluice gate AB 4m length and 2m width, its weight 5kn as shown in figure is installed to control the discharge of water. The end A is hinged. Determine the force normal to the gate applied at B to open it? hinged V Water 60 gate B 1.5m h F.

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