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Unformatted text preview: PHY53 F05 Exam III Name: Section: (I certify I have abided by the Duke Honor Code) Scores: MC Problem 1 Problem 2 Problem 3 TOTAL (24 pts) (20 pts) (25 pts) (31 pts) (100 pts) In questions or problems not requiring numerical answers, express your answers in terms of the symbols given, and standard constants such as g. Where numerical answers are required use g = 10 m / s 2 . For the long problems include clear explanations of your reasoning and working to obtain full credit. Enter your multiple choice answers in the boxes provided below: MC 1 MC 2 MC 3 MC 4 MC 5 MC 6 Multiple Choice (4 points each) 1. Water flows in a horizontal pipe. When the cross-sectional area of the pipe decreases: A) The speed of flow, and the pressure, both increase. B) The speed of flow, and the pressure, both decrease. C) The speed of flow decreases, and the pressure increases. D) The speed of flow increases, and the pressure decreases. E) The speed of flow, and the pressure, both remain unchanged. 2. A traveling harmonic wave on a string is described by: y ( x, t ) = (0 . 5 m) cos [10( x- . 1 t )] The maximum speed of particles in the string is: A) 0.05 m/s perpendicular to the direction of wave propagation....
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- Fall '07