Engineering, 20.12.2019 05:31 princesskhj6932
A1: 50-scale model of a submarine is to be tested in a towing tank under two conditions: motion at the free surface and motion far below the surface. the tests are performed in freshwater. on the surface, the submarine cruises at 24 knots. at what speed should the model be towed to ensure dynamic similarity?
far below the surface, the sub cruises at 0.35 knot. at what speed should the model be towed to ensure dynamic similarity? what must the drag of the model be multiplied by under each condition to give the drag of the full-scale submarine
Answers: 3
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The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false
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Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg. k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m. k
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Analyze the factors that influence the choice between the following pairs of processes to make the products indicated: i) sand casting versus die casting of an electric-motor housing ii) thread rolling versus machining of a bolt for high-strength application. (co3/c5)
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