A-3.25 consider a naca 2415 airfoil section in a low-speed wind tunnel. assume re 9 x 106 a) what is the zero-lift angle of attack? b) does this airfoil have negative or positive camber? c) what is the stalling angle of attack? d) what is the maximum value of ci? e) what is the lift-curve slope?

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.