Sustainable Energy
1st Edition
ISBN: 9781133108689
Author: Richard A. Dunlap
Publisher: Cengage Learning
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Chapter 2, Problem 5P
To determine
Calculate the current average human population density on earth.
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The population of a certain country has grown at a rate proportional to the number of people in the country.at present,the country has 80 million inhabitants. Ten year ago it had 70 million assuming that this trend continues. Find an expression for the approximate number of people living in the country at any time(taking t=0 to be the present time )And the approximate number of people who will inhabit the country at the end of the next ten year period?
Of the earth’s total volumetric supply of water, approximately how much is fresh water and how much is underground water?
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Chapter 2 Solutions
Sustainable Energy
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. 9P
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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.arrow_forwardEstimate the amount of electricity that is projected to be generated from coal in 2017.arrow_forwardThe population of a particular town grows at a rate that is quantitatively equal to the square root of the population at any given period. How long will it take to expand the population from 80,000 to 150,000? a.) 208.9 seconds b.) 238.9 seconds c.) 298.9 seconds d.) 308.9 secondsarrow_forward
- Of the earth’s total volumetric supply of water, approximately how much is fresh water (quantity and percentage)? How much is underground water?arrow_forwardA typical household of four people consume approximately 300 liters of water per day. Express the annual consumption rate of a city with a population of 100,000 people. Express your answer in liters per year and m3 per year.arrow_forwardOne of the National Academy of Engineering Grand Challenges for Engineering is Manage the Nitrogen Cycle. It is important to control the agricultural impact on the nitrogen cycle as engineers attempt to provide a sustainable food supply. To grow an experimental crop to test a new fertilizer, you create a small “farm” with the soil at a depth of 9.5 inches [in]. You use 200 buckets of soil, and each bucket holds 5 gallons [gal] of soil. What is the area of your “farm”in units of square feet [ft2]?arrow_forward
- Which of the following is the largest mass flowrate? A) 13 pound-mass per day B) 5 grams per minute C) 78 milligrams per seconds D) 345 centigrams per hourarrow_forwardA spherical balloon is to be deflated so that its radius decreases at a constant rate of 11 cm/min. At what rate must air be removed when the radius is 10 cm?arrow_forwardWhat is the growth rate of a population of 1000 that has 20 births per 100 individuals, and 10 death per 100 individuals? Group of answer choices 0.20 0.30 0.10 10arrow_forward
- The total world population in 2012 was about 7 billion, and Figure 2.11 shows that at that time the actual world population growth rate was about 1% per year. The figure also shows an anticipated roughly linear decrease in growth rate that extrapolates to zero growth in about the year 2080. Assuming an average growth rate of 0.5% between 2012 and 2080, what would the world population be in 2080? How does this compare with estimates discussed in the text for limits to human population?arrow_forwardAn issue of a magazine contained the following statement. Dropping less than two inches per mile after emerging from the mountains, a river drains into the ocean. One day's discharge at its mouth, 3 trillion gallons, could supply all of country A's households for five months. Based on this statement, determine how much water an average household uses each month. Assume that there are 100 million households in country A.arrow_forwardIf a gas has a pressure of 0.500 atmospheres, a volume of 25.0 L, and its temperature is 35 Celsius, how many moles of gas are there?arrow_forward
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