Problem Set #5 ME 152B Winter, 2009 Due Monday Feb 23 at 5pm MIDTERM #2 WEDNESDAY Feb 25th Reading: Munson, et al, Chapter 9, Sections 9.1, 9.2 (except 9.2.7), 9.3: Chapter 7, Sections 7.6 (especially the Froude number), 7.8, 7.10 (again): Chapter 10, Sections 10.1, 10.2. Problem 1 . Work Problem 9.23 Note: This is an open-ended ‘dagger’ problem, which means that the answer requires some discussion and is not unique. In this case, you might need to assume some reasonable speed for the automobile. Your answers should be quantitative , i.e. some numbers over a reasonable range of highway speeds. Problem 2. Work Problem 9.42 Hint: Since the problem asks you to assume a terminal velocity , the problem is steady in the Lagrangian frame and Newton’s second law reduces to the sum of the forces = 0. Study Examples 9.10 and 9.11 carefully. Problem 3. Work Problem 9.47 Hint: Compute the total force as the sum of the force on the pole (taken as a cylinder) and the sign (taken as a plate perpendicular to the flow). Study Example 9.13.
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