are in feet. The x-axis runs along the line where the wing joins the fuselage. Figure

Chapter 11, Problem 7

(choose chapter or problem)

are in feet. The x-axis runs along the line where the wing joins the fuselage. Figure 11-5ea. The research department finds that innormal flight the pressure pushing up onthe wings varies linearly with x. The pressure is 90 lb/ft2 at the y-axis and20 lb/ft2 at x = 10. Find the total forceacting on the wing.b. Find the first moment of force with respectto the y-axis.c. For the plane to be properly balanced, youneed to know where in the x-direction theforce could be concentrated to produce thesame first moment of force. Find thex-coordinate of the center of pressure.d. During a certain banking maneuver, thepressure pattern changes. It becomes directlyproportional to y and does not vary in thex-direction. The pressure is 60 lb/ft2 at y = 50. Find the total force acting on the wing.e. Find the first moment of force in part d withrespect to the x-axis.f. The first moment of force in part emeasures the amount of twisting needed tomake the plane bank. How far out on thewing could the total force be concentratedand produce the same first moment withrespect to the x-axis?