ENV4001_spr10_final3 - ENV 4001 ENVIRONMENTAL SYSTEMS...

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p 1/9 ENV 4001: E NVIRONMENTAL S YSTEMS E NGINEERING Spring 2010 University of South Florida Final Examination Civil & Environmental Eng. Friday, May 7, 2010 Prof. J.A. Cunningham Instructions: 1. You may read these instructions, but do not turn the page or begin working until instructed to do so. 2. This exam contains 5 questions. All students should answer question #1 and question #2; then select any one of the final three problems. The total points possible is 120. 3. Answer the exam questions on separate sheets of paper (i.e., not on these exam sheets). Make sure your name is on each piece of paper, and that you submit all pages you want graded . At the end of the exam period, staple your papers together in the proper order. You may use as many sheets of paper as you need (though, in the spirit of ENV 4001, I encourage you not to be wasteful). 4. Only turn in the problems that you want me to grade. If you turn in any “extra” problems, I will pick the one that looks like it can be graded the fastest and thereby make my life easier. It is probably not in your interests to submit an “extra” problem. 5. To maximize your partial credit, show all your work and state your assumptions clearly. I can only assign you partial credit if I can follow what you are doing. 6. Report your answers to a reasonable number of significant digits and with proper units. 7. You are allowed to use your text book, your course notes, or other printed materials. You may not receive help from another person. 8. The back of this page contains some constants and unit conversions that you might or might not find helpful. I am also including two additional pages, photocopied from last year’s text book, that have some helpful tables on them. 9. A hand-held calculator is recommended. Other electronic devices are not permitted. 10. Time limit: 120 minutes. Stop working when asked. If you continue working after time has been called, you will be penalized at a rate of 1 point per minute. 11. Don’t cheat. Cheating will result in appropriate disciplinary action according to university policy. More importantly, cheating indicates a lack of personal integrity. 12. Hints: Read each question carefully and answer the question that is asked. Watch your units. If you take good care of your units, they will take good care of you. Work carefully and don’t rush.
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p 2/9 Potentially useful constants: Ideal gas constant, R: 8.314 Pa•m 3 •mol –1 •K –1 = 82.06 × 10 –6 atm•m 3 •mol –1 •K –1 Molecular weight of water, H 2 O: 18.01 g/mole Density of water at 25 °C: 0.9970 g/mL = 997 kg/m 3 Viscosity of water at 25 °C: 0.890 × 10 –3 Pa•sec Density of air at 25 °C: 1.18 kg/m 3 Viscosity of air at 25 °C: 1.85 × 10 –5 Pa•sec Potentially useful conversion factors: Pressure: 1 atm = 760 mm Hg = 760 torr = 101325 Pa 1 Pa = 1 N/m 2 = 1 kg/(m s 2 ) Mass: 1 kg = 1000 g = 10 6 mg = 10 9 μ g 1 metric ton = 1 tonne = 1 t = 1000 kg 1 English ton = 2000 lb mass 1 kg = 2.205 lb mass 1 lb mass = 0.4536 kg = 453.6 g Temperature: 25 °C = 298.15 K Volume: 1 m 3 = 1000 L = 10 6 mL = 10 6 cm 3 1 gallon = 3.785 L Energy : 1 BTU = 1.055 kJ = 1055 J 1 kWh = 3600 kJ Power: 1 W = 1 J/s = 1 N m/s 1 MW = 1000 kW
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