The defining assumption for finding the skin- friction drag on an air – McqOptions

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1.	The defining assumption for finding the skin- friction drag on an airfoil is____
A.	Airfoil is new low-speed airfoil
B.	Skin- friction acts due to shear force
C.	Airfoil has a zero angle of attack
D.	Airfoil is considered a flat plate at zero angle of attack
Answer» E.

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