Hydraulics and Fluid Mechanics in ME
In a free nappe,

The pressure below the nappe is atmospheric
The pressure above the nappe is atmospheric
The pressure below the nappe is negative
The pressure above the nappe is negative

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Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

total drag is zero
highest intensity of pressure occurs around the circumference at right angles to flow
lowest pressure intensity occurs at rear stagnation point
lowest pressure intensity occurs at front stagnation point

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