Hydraulics and Fluid Mechanics in ME
The discharge through a channel of rectangular section will be maximum, if

Its depth is thrice the breadth
Its breadth is thrice the depth
Its depth is twice the breadth
Its breadth is twice the depth

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Hydraulics and Fluid Mechanics in ME
The meatcentric height is the distance between the

Metacentre and centre of buoyancy
Centre of gravity of the floating body and the centre of buoyancy
Original centre of buoyancy and new centre of buoyancy
Centre of gravity of the floating body and the metacentre

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