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?
Correct answer: B
Explanation
The flow must obey Newton's second law (momentum), the continuity equation (mass conservation), and the no-slip condition (velocity is zero at a boundary).