airspeed tam gene Drill CHAPTER 3 PRACTICE PASSAGE An airplane is susceptible to substantial deflection off course due to wind. A pilot calls the engines' contribution the airspeed. This motion relative to the air, combined with the wind velocity, results in the ground speed, or velocity relative to fixed terrestrial objects. 1. A fr d A) n S ground spe wind 2. A) B) C) D) 100 = 10,000 140 2 2 1974/004) 00007 9600 19600- Grandsped Figure 1 10.10x100 00160 $3. A) B) C) D) D) V airspee grou 9600 146- 1700 A) 2 3 ongreed u grands pred Figure 1 10.10-100 00160 When a parachutist typically leaves an airplane, it is not so much a jump as a drop. He steps out of a door or lets go of a strut under the wing, not giving him any significant velocity relative to the airplane. He becomes subject to gravity without the lift of the wings. Air resistance allows the plane to get ahead of him. If we neglect this drag effect, then the parachutist's constant horizontal velocity and constant vertical acceleration gives him a trajectory resembling half of an inverted parabola. This is a reasonable assumption for the free fall before the parachute is engaged. D) A) B) C D) 110 110 011 0.54 po 95100 550 55044 68 | For More Free Content, visit Princeton Review.com