Hydraulics and Fluid Mechanics in ME
A metal with specific gravity of 'a' floating in a fluid of same specific gravity 'a' will

Sink to bottom
Float over fluid
Partly immersed
Be fully immersed with top surface at fluid surface

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Hydraulics and Fluid Mechanics in ME
If the elevation of hydraulic grade line at the junction of three pipes is above the elevation of reservoirs B and C and below reservoir A, then the direction of flow will be

unpredictable
from reservoir A to reservoirs B and C
from reservoir C to reservoirs A and B
from reservoir B to reservoirs C and A

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