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

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

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