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Unformatted text preview: 10 20 30 40 50 60 0-7 7-15 15-22 22-30 30-37 37-45 45-52 52-60 60-67 67-75 frequency CEE 2300, F08, exam 2 page 1 of 3 name: SOLUTION Closed book/notes; 50 minutes; 75 points. 1. (25 pts) Short answer. Put answers in spaces provided. a) Approximately how much air does an adult inhale per day? ~ 15 m 3 (5-30 m 3 ) (1) Approximately how much water does an adult ingest per day? ~ 2 L (1-8 L) (1) Give a limitation in assessing human health risk using results from each of the following. animal studies: extrapolation across species and to low dose epidemiologic studies: statistical not causal; confounding issues (2) What are the two leading causes of death in the U.S.? (1) heart attack (2) cancer (2) b) Biomass fuels have a similar carbon intensity (gC/MJ) as coal. So why is their use proposed as a means to reduce global warming? consumes CO2 when grown (1) On an energy basis, is natural gas, oil, coal or uranium most abundant? uranium (1) On an energy basis, is natural gas, oil, coal or uranium most used? oil (1) Energy intensity (MJ/GDP) in the U.S. and Canada is higher than in many European countries with similar standard of living. Give two reasons why this might be so. (1) low population density – greater need to transport goods (2) less efficient; more wasteful – e.g. large cars, excessive heating & cooling (2) True or false. Since the 1970s, U.S. per capita energy consumption has been steady. true (1) c) At what rate is the atmospheric CO 2 concentration increasing? ~ 2 ppm/yr (0.5-4 ppm/yr) (1) List three strategies for stabilizing or reducing CO 2 levels in the atmosphere....
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- Spring '08
- mass balance equation, balance equation, PM mass balance, mass balance eq