Figure 10.31 a illustrates the variation of the lift coefficient, C_{L} as a function of angle of attack, α and the aspect ratio, AR, while Figure 10.31b illustrates the variation of the drag coefficient, C_{D} as a function of angle of attack, α and the aspectratio,AR. Consider an airplane with wings that have aplanform areaof 1600 ft^{2} ,as illustrated in Figure EP 10.25. Assume that the airplane cruises at an altitude of 45,000ft (air at standard atmosphere at an altitude of 45,000ft, \rho = 0.00046227 slugs/ft^{3} ) at a steady cruising speed of 350 mph, with a cruising angle of attack of 5^{\circ } . (a) Determine the lift force and the drag force for an aspect ratio of 7. (b) Determine the lift force and the drag force for an aspect ratio of 3.