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

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

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Fluid Mechanics
Shear stress in a fluid flowing in a round pipe

Remains constant over the cross-section
Is zero at the wall and increases linearly to the centre
Varies parabolically across the cross-section
Is zero at the centre and varies linearly with the radius

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