Fluid Mechanics
The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation

dq/dx = K
dq/dx = Kq²
dq/dx = K/q
dq/dx = K.q

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Fluid Mechanics
The continuity equation

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

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