Given the component of free-stream velocity in the direction perpendi – McqOptions

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1.	Given the component of free-stream velocity in the direction perpendicular to the camber line is 15 units and the velocity induced by the vortex sheet is 4 units at a point. The angle of attack for the thin airfoil is α. Then which of the following condition is true in case of thin airfoil theory?
A.	15sinα+4=0
B.	15+4=0
C.	15cosα+4=0
D.	15tanα-4=0
Answer» C. 15cosα+4=0

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