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

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

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Fluid Mechanics
A differential pressure cell is used for

Measuring small pressure difference in liquids
Measuring the difference of the impact & the static pressure
Measuring small pressure difference in gases
Remote recording of pressure difference

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