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The horizontal and vertical hydrostatic forces Fx and Fy on the semi-circular gate, having a width ‘w’ into the plane of figure, are   

                                                    

     (a) Fx = $\rho$ghrw and Fy = 0     

      (b) Fx = 2$\rho$ghrw and Fy = 0

      (c) Fx = 2$\rho$ghrw and Fy = rgwr2/2

      (d) Fx = 2$\rho$ghrw and Fy = prgwr2/2

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