2) (10 points) We all consume water to keep ourselves alive. After the water was used, it is returned to the hydrologic cycle. Imagine one of our ancestors who lived 200,000 years ago.
a) Calculate the amount of water that went through his body under the assumption that he consumed on average 2 liters per day and lived for 30 years.
b) How many molecules that passed through the body of this person are in 1 liter of NYC drinking water? Assume that all water reservoirs on the earth are well mixed over the past 200,000 years which means that those molecules used by our ancestor are evenly distributed in the hydrolologic cycle (18 grams (= 18 ml) of water contain about 6·1023 molecules, use the reservoir size from the book or from the class' web site). The result is of the order of 108 molecules! Clearly write down how you obtained your result.
3) (6 points) Europeans express the mileage of a car in liters of gasoline per 100 km driven. My car uses about 6.5 liters/100 km. Convert this consumption rate into miles per gallon.
4) (10 points) On the CLIMVIS webpage (http://www.ncdc.noaa.gov/onlineprod/drought/xmgr.html#gr) find the weather station that is closest to your place of birth that has at least 50 years of record of annual preciptation.
a) Download the data and import them into EXCEL. Determine minimum, maximum, average and standard deviation of the data using the equivalent EXCEL functions (MIN, MAX,AVERAGE,STDEV).
b) Make a histogram of the precipitation data
(see example below), print it out and hand it in.
Example discussed in class: New York/LGA data and the histogram:
