Hydraulics and Fluid Mechanics in ME
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

14π R1/2/15Cd × a √(2g)
14π R3/2/15Cd × a √(2g)
14π R5/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)

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Hydraulics and Fluid Mechanics in ME
When a body is placed over a liquid, it will float if

Gravitational force is equal to the up-thrust of the liquid
None of these
Gravitational force is less than the up-thrust of the liquid
Gravitational force is more than the up-thrust of the liquid

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