4. A glider weighs 2,000 lb, has a wingspan of 50 ft, and a wing area of 120 ft. The vehicle has a CD, of 0.016 and an e of 0.8. It is starting at an altitude of 5,000 ft. a. If the lift coefficient is 0.5, what is the glide angle? (1 pt) b. For the same condition as a), what is the rate of descent? (1 pt) c. Construct a glide polar for this airplane. You can assume that the CL=Cw, which is approximately true for small glide angles. The speed range for the plot should be from 75 fps to 150 fps. (3 pt) d. Using the graph and/or the data used to generate it, what is the best sink rate possible? What speed does this occur at? (2 pt) e. At that sink rate how long would the aircraft be able to remain aloft from its starting altitude? (1 pt) f. What is the best glide angle achievable? What speed does this occur at? Hint: you g. should be calculating the glide angle based on L/D in order to build the glide polar. (2 pt) How far could the airplane travel at the best glide angle? (1 pt)