The pilot of a 90,000-lb airplane which is originallyfl ying horizontally at a speed of

Chapter 3, Problem 3/197

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The pilot of a 90,000-lb airplane which is originally flying horizontally at a speed of 400 mi / hr cuts off all engine power and enters a \(5^{\circ}\) glide path as shown. After 120 seconds the airspeed is 360 mi / hr. Calculate the time-average drag force D (air resistance to motion along the flight path).

                       

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