Hydraulics and Fluid Mechanics in ME
A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because

It is not possible to conduct this experiment with any other tube
Glass tube is cheaper than a metallic tube
It is easier to see through the glass tube
All of these

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

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

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