What four equations provide for the four unknowns u, v, w, p that are most often of interest in fluid mechanics?
(A) Continuity, momentum
(B) Continuity, momentum, energy
(C) Continuity, momentum, energy, equation of state
(D) Continuity, momentum, energy, enthalpy relation
(A) Continuity, momentum
The momentum equation is a vector equation containing the three velocity components u, v, w, and p. Continuity provides the fourth equation. The energy differential equation enters only when temperature is an unknown.
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