GEOG 2500 Lecture 3: Planktons Notes

Photosynthesis by land plants leads to the fixation each year ofabout 1 kg of carbon on the average for each square meter of anactively growing forest. The atmosphere is approximately 20% O2 and80% N2, but contains 0.046% CO2 by weight.
A.) What volume of air at 25 oC and 1 atm is needed to provide this1 kg of carbon?
B.) How much carbon is present in the entire atmosphere lying aboveeach square meter of the earth s surface?
C.) At the current rate of utilization, how long would it take touse all the CO2 in the entire atmosphere directly above a forest?For this problem, make the (unreasonable, but greatly simplifying)assumption that circulation and replenishment mechanisms for theair above the forest are cut off

A typical nuclear reactor generates 1000MW (1000MJ/s) of electrical energy. In doing so, it produces 2000MW of "waste heat" that must be removed from the reactor to keep it from melting down. Many reactors are sited next to large bodies of water so that they can use the water for cooling. Consider a reactor where the intake water is at 18∘C. State regulations limit the temperature of the output water to 30∘C so as not to harm aquatic organisms. How many liters of cooling water has to be pumped through the reactor each minute?