Repeat Problem 7.10, considering the flow of Problem 7.11

Data from Problem 7.10:

Calculate the percentage error obtained if Problem 7.9 is solved using (incorrectly) the incompressible Bernoulli equation.

Data from Problem 7.9:

An airfoil is in a freestream where p∞ = 0.61 atm, ρ∞ = 0.819 kg/m³, and V∞ = 300 m/s. At a point on the airfoil surface, the pressure is 0.5 atm. Assuming isentropic flow, calculate the velocity at that point.

Data from Problem 7.11

Repeat Problem 7.9, considering a point on the airfoil surface where the pressure is 0.3 atm.