A 4 m long quarter circular gate of radius of 3 m and of negligible weight is hinged about its upper edge A as shown in figure. The gate controls the flow of water over the ledge at B, where the gate is pressed by a spring. The resultant hydrostatic force on the circular gate (in kN, rounded off to two decimal places) when the water level rises to A at the upper edge of the gate is 10 ª 3 m www Spring (k =8.5 x 10' N/m)

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