A thin airfoil is mounted in a low-speed, subsonic wind tunnel, in whi – McqOptions

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1.	A thin airfoil is mounted in a low-speed, subsonic wind tunnel, in which the Mach number is 0.1. At a point on the airfoil, the pressure coefficient is measured to be 1.2. If the flow velocity is increased such that the free-stream Mach number is 0.6, the pressure coefficient at the same point on the airfoil will approximately be:
A.	-3.5
B.	-2.9
C.	-1.5
D.	-0.75
Answer» D. -0.75

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