Fluid Mechanics
Euler's equation of motion is a statement expressing

Conservation of energy
Newton's second law of motion
Conservation of mass
Newton's first law of motion

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

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

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