an airfoil that can supply 25,000 N of lift more than its N of drag at an altitude of 5,000 m. with a minimum airspeed of 335 kph.

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.