FluidsII-Midterm1-08

FluidsII-Midterm1-08 - 530.328 - Fluid Mechanics II, 2008,...

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530.328 - Fluid Mechanics II, 2008, Midterm Exam 1 Closed books & notes. Time: 15 minutes or less. Develop answers on the available place. (approx 30%) NAME. ................................................................ 1. A plane used to combat forest fires moves at constant velocity V from left to right as shown below. The river from which it is scooping up water is moving from right to left at speed U. The plane takes on water which has a density ρ with a scoop which has a width w into the page. It dips a height h into the water. The drag force on the rest of the airplane (excluding the effect of the scooping up of water) is F d . Evaluate the total thrust needed from the engine required to keep the plane moving at constant velocity V. Clearly mark what control volume you are using, and state in which reference frame you are formulating the problem. 2. If the velocity vector is given by the three components (u,v,w) as in ! V = u ! i + v ! j + w ! k . What does the quantity ! u ( CS "" ! V # ! n ) dA stand for? (a) Average velocity in x-direction applied to the control surface (b) Rate of change of gravitational potential energy in the x-direction
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FluidsII-Midterm1-08 - 530.328 - Fluid Mechanics II, 2008,...

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