Set 1 January 25, 2002

1. Using your answer from exercise 1.4 (rubber wear from tires), calculate how many particles, all with diameter 10 micrometers, fly off with each turn of the wheel.

2. Using your approach to exercise 2.2 (spacing of water molecules), calculate the distance between water vapor molecules, at STP.

Set 2 February 4, 2002

1. If I donate a pint of blood what fraction of my total blood did I donate?

2. Express the price of regular gasoline in dollars per liter.

3. If the specific gravity of concrete is 2.3, express the density of concrete in kilograms per cubic meter.

4. If the density of air is 1.0 kg/liter, and the average adult breathes 20 m3 air per day, how many pounds of air does the average adult breathe per day?

5. How many liters are in one adult human breath?

6. Assuming that 90% of the mass of the atmosphere in the troposphere and the height to the tropopause is 12,000 meters, use the earth's surface area to calculate the mean density of the air in the troposphere.

7. Make estimate of the water consumed each month, in gallons, by a faucet that drips 2 drops per second.

Set 3 March 4, 2002 (spreadsheet assignment)

1. Using Appendix table XII.2, calculate the total biomass (stock) of carbon in each of the ecosystem types.

2. Using Appendix table XII.2., calculate the avg. npp as kg(C) per year

3. Using Appendix table XII.2., calculate the residence of carbon in each of the ecosystem types.

FYI, download my spreadsheet answers in tab-delimited format. Right click and Save-Link-As... in Netscape.

Last modified: Monday, March 4, 2002 Dr. Bruce Wyman
www.faculty.mcneese.edu/wyman/es350problemsets2002.htm