04_Population and Tragedy_s11

# 04_Population and Tragedy_s11 - 103-14 105.19 101-5 102-9...

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Page 3 If your name is on this list, register your clicker. Fields Rickman Miller Spears 6B938

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Page 5 6,898,483,847

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Population Currently there are 6.9 billion people on earth (6.9 x 10 9 ) The rate at which population grows is proportional to the existing number of people - The number of people born depends on the number of potential parents - At the current rate of growth the population doubles every 35 years (as people live longer this gets shorter) - If you (and a partner) have 2 children by 35 and they do the same when you are 70 there will be six of you. - Then assuming you die off (which having kids can cause) the population has gone from 2 when you where <35 to 4 when you are gone at 70… This is exponential growth

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Exponential vs. linear growth Linear growth - increase by a fxed amount each interval - E.g. : You make \$20,000 and get a \$2,000 raise each year
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## This note was uploaded on 02/28/2011 for the course PHYS 105 taught by Professor Staff during the Spring '08 term at Maryland.

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04_Population and Tragedy_s11 - 103-14 105.19 101-5 102-9...

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