cee11-fa08-mt1-Harley-soln

cee11-fa08-mt1-Harley-soln - Page 1 Midterm Exam #1 CE I l...

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Unformatted text preview: Page 1 Midterm Exam #1 CE I l & Engineered Systems and Sustainability University of California at Berkeley Fall 2008 NAME: instructions: answer the questions that follow directly on these pages in the spaces provided. Use the back of the page if you need more room for your answer. If you believe there is insufficient information provided to answer a question completely, state reasonable additional assumptions and proceed from there. The exam is closed—booklciosed-notes. You may use a calculator. Please write your name in the space provided abovet Time: 50 minutes. Question: Score: Out of: 1 W 7 2 m 6 3 _ 7 BONUS _ TOTAL 20 BONUS QUESTION: What did Thomas Malthus write in 1798 about the growth rates of human population vs. food production? For what reasons has he been criticized as being too pessimistic? pta'prt’efifitnliw 6W9“ ital/9 W/hrll‘fi/[y J mitts“ :45; to fit tau-19m, agave-fl: raft £b11%mx7( r-mzpptfl Psi/344' rel/t .0 P c -- 60 C ewe/1,4“ e/flc/V 0;” fight-w 5 L/ Ohm-egg 01" L12, (TLC/MAE 371% PM ‘6, fire-VWLILI' ma Z Emil/‘65; Mu% . Page 2 1. ANOTHER GREENHOUSE GAS... Carbon tetrafiuoride (CF 4) is a potent greenhouse gas with a very long atmospheric lifetime (50 000 years) and negligible solubility in water. It forms for exampie during electrolytic production of aluminum metal by combination of carbon atoms from a graphite electrode with fluoride ions. Given a current atmospheric concentration of 74 parts per trillion (ppt, 1 part in 1012 on 3 mol fraction scale), calculate the totai mass of CF4 present in the atmosphere. _ .3. =1 \ f A Imam :- m z: Littlech .3 Llrrflg‘r‘s’xmm x to Fe DUE/beef}; levee 3 “L 9 M/s‘fl” r =1 5 2 pc IO kg '10 (i’I/Loifaf? h : ho : (I )XEO Q/l‘r cur W130 (é, pile/FLf 3 7‘: 3(- Raw, )0 (:fo lo ‘_ \yggxlg tubal Owl-mfl (3/wwl mom q M 2 pear y C? OE“ .. ‘+ {Z Page 3 2. HOT WATER HEATER A gas—fired water heater held at 140°F is kept in 21 70°F room. When purchased, it’s insulation is equivalent to R:5 (recall the R value for insulation is in units of hr ft2 °F BTU“). How much money would be saved on your gas bill each year by adding a 25 ft2 blanket that increases the insulation R value to 15? Assume gas costs $1.70 per therm (recall 1 therm r 105 BTU), and that only 85% of heat released from burning the gas goes to heating the water (the rest of the fuel energy is lost with the hot exhaust). ii“ (SQ: AAT m AAT guani- iOS s Paid (2wa v... l} l a; W >< 70"): =~< (# 5 l 5 U Alum/mg :: '2‘? ‘3 Grill-t 7L (Ll—i ’CvL, 3 Eig— 618%) «guy;er lass lea deb-L1 \/ r 3 God M I v " MWULC‘JZ COS? (q)— : 9'0; Lt ~HeLm-1xw 137C, >4 maniwa - o a 8‘ E HM“ E Weed Ii BTbL J4me" °<= Page 4 3. POPULATION GROWTH Compare exponential and logistic growth projections given a world population in 1850 of 1 billion, with a growth rate of 2% per year as of 1850. (a) Predict worid population in 2010 a33umiiig exponential growth 0,02 \fr‘r’ w.— i“ i—«i u. —-. ff /7‘\‘/D? >< ego/3 Iboyr —.... 29h§ (b) Predict population in 2010 assuming logistic growth with a carrying capacity of 12 billion. Note the 2% per year rate of population growth given for i850 is not the same as to be used in the logistic growth equation. To get fuli credit on this problem, you shouid use the correct value of I, but you may proceed using 122% per year for partial credit. u ,n I , iv , .m .142, in {3?}! %;:030N0 M rNC I K) sis is —; PC, 1. 02/7" :1 coal? /_,___5VI:E I" VP 9W mi swig 1 Jam L. i) :2 no yrs 1' “9 N w K h {2 MO? ._ «firm "" 1 - H a rag J H gaffe-£313 few/w Vt» ...
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This note was uploaded on 12/01/2011 for the course CE 13972 taught by Professor Chow during the Spring '09 term at University of California, Berkeley.

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cee11-fa08-mt1-Harley-soln - Page 1 Midterm Exam #1 CE I l...

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