The velocity components of a 2D incompressible flow are given by u = x + y and v = x - y. Is this flow physically possible (i.e., does it satisfy the continuity equation)?

Which equation represents the steady 1D continuity equation for a compressible fluid flow?

In a steady fluid flow, the velocity of the fluid at any given point:

Which of the following expressions represents a possible stream function (Ψ) for a two-dimensional incompressible flow?