(a) Using diagrams, explain what is meant by equality of hydrostatic pressure. (b) A 4 m diameter circular gate is located in an inclined wall of a large reservoir containing water, see Figure Q3b. The gate is mounted on a shaft along its horizontal diameter. For a water depth of 10 m above the shaft determine: (a) the magnitude and location of the resultant force exerted by the water on the gate, and (b) the moment that would have to be applied to the shaft to open the gate. [8] Water surface Additional Information: 10m 60 OK Stop Shaft Figure Q3b gravity g=9.81 m/s; water density pw = 1000 kg/m YR = (IX / (Ye X A)) + Yc Ix = R/4 for a circular disc of radius R