Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

semi-log plot of friction factor against Reynolds number
log-log plot of relative roughness against Reynolds number
semi-log plot of friction factor against relative roughness
log-log plot of friction factor against Reynolds number

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Hydraulics and Fluid Mechanics in ME
The conditions for the stable equilibrium of a floating body are

the meta-center should lie above the center of gravity
the center of buoyancy and the center of gravity must lie on the same vertical line
all the above are correct
a righting couple should be formed

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