Hydraulics and Fluid Mechanics in ME
In an immersed body, center of pressure is

below be center of gravity
above the center of gravity
at the center of gravity
could be above or below e.g. depending on density of body and liquid

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Hydraulics and Fluid Mechanics in ME
The hammer blow in pipes occurs when

The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
The pipe bursts under high pressure of fluid
There is excessive leakage in the pipe
The flow of fluid through the pipe is gradually brought to rest by closing of the valve

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