Fluid Mechanics
Which of the following must be followed by the flow of a fluid (real or ideal)? (I) Newton's law of viscosity. (II) Newton's second law of motion. (III) The continuity equation. (IV) Velocity of boundary layer must be zero relative to boundary. (V) Fluid cannot penetrate a boundary.

I, II, III
II, IV, V
II, III, V
I, II, V

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Fluid Mechanics
Steady flow occurs, when the

Conditions change steadily with time
Conditions are the same at the adjacent points at any instant
Rate of the velocity change is constant
Conditions do not change with time at any point

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