Hydraulics & Fluid Mechanics
Two pipe systems are said to be equivalent when

friction factor and length are same in two systems
length and diameter are same in two systems
head loss and discharge are same in two systems
length of pipe and discharge are same in two systems

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Hydraulics & Fluid Mechanics
Metacentric height is given as the distance between

center of buoyancy and metacentre
the center of gravity of the body and the center of pressure
the center of gravity of the body and the center of buoyancy
the center of gravity of the body andthe meta center

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