Fluid Mechanics
Steady fluid flow occurs, when the derivative of flow variables satisfy the following condition.

∂/∂s = constant
∂/∂t = 0
∂/∂s = 0
∂/∂t = constant

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Fluid Mechanics
The continuity equation

None of these
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

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