For a plane surface submerged in a liquid, the total hydrostatic force equals the liquid unit weight multiplied by the surface area and the:
Correct answer: D. Depth of its centroid
- A. Distance to its pressure centre
- B. Depth of its top edge
- C. Depth of its bottom edge
- D. Depth of its centroid
Explanation
The resultant hydrostatic force is γA h̄, where h̄ is the vertical depth of the surface centroid below the free surface. The centre of pressure locates the force, but its depth is not used directly in this magnitude formula.
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Hydraulics studies fluid properties, pressure, buoyancy, continuity, Bernoulli's equation, momentum, pipe flow, open-channel flow and hydraulic machines. Water resources extends these principles to pumps, turbines, reservoirs, irrigation, floods and hydrology, while distinguishing laminar from turbulent flow and uniform from gradually varied channel flow.
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