Question 2Question 3Question 4Question 5Question 6Question 7Question 8Question 9Question 101. You decide to join a recently formed model airplane and rocket club at the University, where they have many different types of unusual planes and rockets for members to have fun with.Youfirst try a remote-controlled propeller driven model plane. You notice that even without changing the wings, you can move the plane up or down by changing the speed. Why does changing the speed affect the forces on it which cause it to move up or down?AnswerB. The lift from the wing becomes larger.10 points Question 21. The propellar plane levels out and continues on at a constant speed in a constant direction. The acceleration of the plane is therefore zero and so is the NET force on it. However, the propellar exerts a force on the air in the reverse direction to accelerate it, and so the air exerts a force on the propellar in the forward direction which produces a thrust on the plane. the acceleration of the plane is zero becauseAnswerB.the forward thrust on the plane is exactly balanced by the air drag forcein the opposite direction.10 points Question 31. You decide to try and turn the plane. You dip the plane's left wing and raise the right wing and the plane begins to turn to the left. What force is causing the acceleration to the left?C.The lift on the wing now points diagonally up to the left10 points Question 41. The plane is once more flying straight ahead. You decide to make the plane rise quickly. You tip the nose up suddenly, hoping it ascends. However, the plane practically stops in midair and falls. What happened?B.The airstream separated from the top of the wingand it stalled.Question 51. After this latest disaster, you decide to go for broke and try a very expensive model jet plane. You rapidly accelerate the plane to 300 miles per hour. From the plane s perspective the air is passing by at 300 mph. Describe the speed and pressure of the air entering the large inlet duct of the jet engine.AnswerA.The air pressure at the entrance duct is higher, and the speed lower.10 points Question 61. After a long day you go home in your friend's really fancy sports car which has a sun-roof on thetop and a spoiler (a little wing-like surface which is above the trunk and the rear wheels.) When you open the sun-roof on the top of the car your ears start to feel a bit funny. This happens becauseAnswerB.The air pressure inside the car drops suddenly because the air pressure on top of the car is less than atmospheric.10 points Question 71. You are looking at a picture of an airplane in the air and see that it's nose is pointing slightly up, away from the ground. You conclude that the airplane isCould be either gaining altitude, losing altitude, or flying at constant altitudeQuestion 81. A stunt pilot flips the plane upside down and is flying straight at constant altitude, and suddenly realizes that there is a tall building ahead that he may hit. To clear the building, hewould need toAnsweruse the elevator control in a manner that is the opposite of what he would do in normal flight10 points Question 91. Compared to a turbojet, a turbofan jet engine is better for commmercial planes becauseAnswerIt needs less fuel for a given amount of thrust than a turbojet10 points Question 101. Fast large passenger planes designed to fly long routes use turbofan engines instead of propellers becausePropellers become inefficient when an airplane reaches high