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

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

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Hydraulics and Fluid Mechanics in ME
Slip of a reciprocating pump is negative, when

Suction pipe is long and delivery pipe is short and the pump is running at high speeds
Suction pipe is short and delivery pipe is long and the pump is running at low speeds
Suction pipe is short and pump is running at low speeds
Delivery pipe is long and pump is running at high speeds

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