Fluid Mechanics
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

Vs/Dp³
Vs/Dp²
Vs²/Dp²
Vs²/Dp³

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Fluid Mechanics
The continuity equation

None of these
Relates mass flow rate along a stream tube
Stipulates that Newton's second law of motion must be satisfied at every point in the fluid
Relates work and energy

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