Chapter 13, Problem 52P

The 251-Mg jet airliner has three engines, each of which produces a nearly constant thrust of 230 kN during the takeoff roll. Determine the length s of runway required if the takeoff speed is 228 km/h. Compute s first for an uphill takeoff direction from A to B and second for a downhill takeoff from B to A on the slightly inclined runway. Neglect air and rolling resistance. Assume e = 0.6°. B Horizontal Answers: Uphill from A to B: S = i m Downhill from B to A: S = i

The 245-kg glider Bis being towed by airplane A, which is flying horizontally with a constant speed of v = 183 km/h. The tow cable has a length r = 59 m and may be assumed to form a straight line. The glider is gaining altitude and when e reaches 14°, the angle is increasing at the constant rate 0 = 8 deg/s. At the same time the tension in the tow cable is 2370 N for this position. Calculate the aerodynamic lift L and drag D acting on the glider. Assume o = 10°. D B A

The 332-Mg jet airliner has three engines, each of which produces a nearly constant thrust of 213 kN during the takeoff roll. Determine the length s of runway required if the takeoff speed is 226 km/h. Compute s first for an uphill takeoff direction from A to B and second for a downhill takeoff from B to A on the slightly inclined runway. Neglect air and rolling resistance. Assume 0 = 0.6°. Horizontal Answers: Uphill from A to B: S = Downhill from B to A: S = i m B.