Hydraulics and Fluid Mechanics in ME
The efficiency of a hydraulic press is given by (where W = Weight lifted by ram, P = Force applied on plunger, A = Area of ram, and a = Area of plunger)

(p/W) × (a/A)
(W/p) × (A/a)
(W/p) × (a/A)
(p/W) × (A/a)

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

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

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