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P7-S10-Practice-Final-2 - Physics 7B Spring 2010 Practice...

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Physics 7B Spring 2010 Practice Final 2 Exam Cover Sheet INSTRUCTIONS: Right now, as soon as you get this part of the exam: 1. Fill in this cover sheet completely . 2. Put your name and your DL section on each page of the exam. This is important!! The pages are separated for grading! 3. Count the pages of the final exam. There should be 10 pages total with problems and questions on pages 2 - 9. If you find this is not the case, inform the proctor IMMEDIATELY. It is your responsibility to have a complete exam. Remember: * You may not know the answer or immediately know what to do when you first read a question. You are being tested on your ability to think. So think about how you can apply the general models and methods you have learned to the particular situations discussed in the questions. * Don’t Cheat! We automatically report anyone suspected of cheating to Student Judicial Affairs. I certify by my signature below that I have read the above instructions and that I will abide by the UC Davis Code of Academic Conduct. This includes not copying from anyone else’s final not letting any other student copy from my final not discussing this final exam with any student who has not yet taken it, nor providing any information, written or oral, that might get to a student who has not yet taken it Name (Print Clearly): Last first 7B Lecture (A, B, C, or D) _______ DL Section Number: (This is a number between 1 and 11) Signature:______________________________________ You may begin the final as soon as you have completed this and the following: put your name, DL section number, and first three letters of your last name on each of the following eight pages (pp. 2-9) . WARNING – DO NOT ASSUME THAT THE PROBLEMS ON THE REAL FINAL WILL BE “JUST LIKE” THESE. ALL PHYSICS PROBLEMS ARE DIFFERENT AND YOU NEED TO THINK AND ANALYZE TO DO THEM. THESE ARE JUST TO HELP YOU PRACTICE THIS SKILL.
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1. Air flows from left to right with no resistance through a downward sloping pipe that has different diameters in two different sections, as shown below. A smaller tube is connected below the pipe and partially filled with water. a) (1.0 pts) Is the kinetic energy density larger at point 1 or 2? Explain in one sentence. The kinetic energy is larger at point 1 due to the continuity equation A 1 v 1 =A 2 v 2 , which implies that the velocity at point 1 is greater since the cross sectional area is less there. b) (1.0 pts) Is the potential energy density larger at point 1 or 2? Explain in one sentence. The potential energy density is higher at point 1, since it’s higher. c) (1.5 pts) Is the pressure higher at at point 1 or 2? Use the Bernoulli equation to determine this, and explain the result in one sentence. We take the difference between point 2 and point 1 to get ( P 2 P 1 ) + ρ 2 v 2 2 v 2 1 + ρ g ( h 2 h 1 ) = 0 and since the second and third terms are negative, P 2 > P 1 d) (1.0 pts) Will the water level be higher in the tube below point 1 or below point 2?
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