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MindTap Engineering for Dunlap's Sustainable Energy, SI Edition, 2nd Edition [Instant Access], 1 term (6 months)
2nd Edition
ISBN: 9781337551755
Author: DUNLAP
Publisher: Cengage Learning US
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Chapter 2, Problem 4P
To determine
Calculate the time in the past at which the human population was 2.
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5. A population of 4 million inhabitants grows at a rate of 3% annually.Calculate the population size at the end of 5 years.
Read the question carefully and give me complete solutions. Please don't miss anything.
Environmental Engineering, disaggregation exponential growth question:
Consider the following disaggregation of carbon emissions:
Carbon emissions (kg C/year)= [Population] x [Energy (kJ/year/person)] x [Carbon (kg C/Energy (kJ)]
Using the following estimates for the United States and assuming growth rates remain constant,
1990 amounts:
Population: 2.5 x 108, growth rate: 0.6%
Energy: 3.2 x 108 kJ/yr/person, growth rate: 0.5%
Carbon emissions: 1.5 x 10-5 kg C/kJ, growth rate: -0.3%
Find:
a) The carbon emission rate in 2020
b) The carbon emitted in those 30 years
c) The total energy demand in 2020
d) the per capita carbon emission rate in 2020
Chapter 2 Solutions
MindTap Engineering for Dunlap's Sustainable Energy, SI Edition, 2nd Edition [Instant Access], 1 term (6 months)
Ch. 2 - A quantity has a doubling time of 110 years....Ch. 2 - The population of a particular country has a...Ch. 2 - Prob. 4PCh. 2 - Prob. 5PCh. 2 - The total world population in 2012 was about 7...Ch. 2 - The population of a state is 25,600 in the year...Ch. 2 - The population of a country as a function of time...Ch. 2 - Prob. 9PCh. 2 - Prob. 10PCh. 2 - Prob. 11P
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- The population of a city in the year 2000 was 82,300. If average percent increase in population of the city in the year 2020 estimated geometrical increase will nearly be Given r-35% per decade.arrow_forwardThe population of a country as a function of time is shown in the following table. Is the growth exponential?arrow_forwardA city has a recorded population of 120,000 and 140,000 in the years 1980 and 2015 respectively. If the city has a saturation population of 180,000 then estimate the 2030 population using declining rate of growth.arrow_forward
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- The population of a particular country has a doubling time of 45 years. When will the population be three times its present value?arrow_forwardA water treatment plant in a city is to be upgraded to meet the needs of the population in the year 2025, and the water distribution system is to be expanded to meet the needs of the population in the year 2045 or 2055. The 2010-population of the city was 225000, and based on a saturation population of 2,500,000, the 2070-population is estimated to be 420000. Estimate, using decreasing rate of increase method, the city's population in 2025, 2045 and 2055 to facilitate the design of these systems. Don't attempt wrongarrow_forwardConsider an island with a population density of 50 people/km2 . If the annual growth is 2%, determine the year in which the population density be equal to 20,000 people/km2arrow_forward
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