204. An airship is to operate at 20 m/s in air at standard conditions (p 1.225 kg/m³, p 101,300 Pa). Amodel is constructed to scale and tested in a variable-pressure wind tunnel at the same air temperature to=determine the drag.GOOD YEARThe Goodyear Blimp is an example of an airship.(a) What criterion should be used to determine dynamic similarity? (You may assume that roughness is notimportant for this problem.)(b) If the model is tested at 20 m/s, what pressure should be used in the wind tunnel?(c) If the model drag force is found to be 250 N, what will be the drag of the full-scale airship?

Answered: 20 4. An airship is to operate at 20…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A wave-energy harvester is to be built off the north shore of Honolulu (seawater at 20°C) where the average wave speed is V = 15 m/s. The size of the prototype device is characterized by its height H Laboratory water tank (fresh water at 20°C) where the wave speed is 5 m/s (shallow water wave speed is only a function of depth). 6 m. A model is to be tested in the Davidson (a) express the predicted power generated W as a function of density p, height H, wave speed V, and gravity g. (b) similarity. (c) output. Derive a set of dimensionless parameters using the Pi theorm that will Determine the height of the laboratory model device to ensure dynamic If the model produces 6.85 kW, determine the expected prototype power
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