Hydraulics & Fluid Mechanics
In which of the following the friction drag is generally larger than pressure drag?

an airfoil
a circular disc or plate held normal to flow
a cylinder
a sphere

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Hydraulics & Fluid Mechanics
According to Bernoulli’s equation for steady ideal fluid flow

the energy is constant along a stream-line but may vary across streamlines
principle of conservation of mass holds
velocity and pressure are inversely proportional
total energy is constant throughout

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

force on a vertical projection of the curved surface
product of pressure intensity at its centroid and area
weight of liquid vertically above the curved surface
force on the horizontal projection of the curved surface

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