College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Airplanes are able to fly by utilizing Bernoulli's principle. The shape of an airplane's wing is called an airfoil, and it serves a very particular purpose: the top surface of the airfoil creates a longer path for air to travel than the bottom surface. This creates lift, going upward. View the picture.
Question A: Incoming air on the left either goes over or under the airfoil. If it goes under it must travel a distance of 10 m in 35 ms. What is the speed of the air under the wing? Answer in m/s
Question B: Air that goes over the wing must travel a much 11 m in the same 35 ms. What is the speed of the air over ths wing? Answer in m/s
Question C: What is the difference in pressure between the top and bottom of the wing? You can ingore the thinkness of the wing since the weight of potential energy density is negligible compared to the difference in air speed. At cruising altitude, the density of air is about 0.4 kg/m^3. Please give a positive answer and show in N/m^2
Question D: This pressure difference is what generates a lift force. If the airfoil has an area of 400 m^2, what lift force is exerted on the plane? Please answer in newtons.
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