Hydraulics and Fluid Mechanics in ME
A hydraulic accumulator normally consists of

A cylinder, a piston, storage tank and control valve
Two cylinders, two rams and a storage device
Two coaxial rams and two cylinders
A cylinder and a ram

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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
all the above are correct
the meta-center should lie above the center of gravity

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