Chapter 8: Problem 12
If an average American is responsible for consuming a barrel \(^{80}\) of oil every 18 days, what power does this correspond to, in Watts?
Chapter 8: Problem 12
If an average American is responsible for consuming a barrel \(^{80}\) of oil every 18 days, what power does this correspond to, in Watts?
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As we exploit the best coal resources first, working our way from the premium Anthracite towards Lignite (Table \(8.1\) ), will we need to mine more coal, or less, to achieve the same energy output from coal, in terms of mass removed?
One liter of gasoline \((1,000 \mathrm{~mL})\) has a mass of about \(750 \mathrm{~g}\) and contains about \(9.7 \mathrm{kWh}\) of energy. Meanwhile, a typical AA battery occupies \(7.4 \mathrm{~mL}\) of volume at a mass of \(23 \mathrm{~g}\), while holding about \(0.003 \mathrm{kWh}\) of energy. How much volume and how heavy would a collection of AA batteries be in order to match the energy in a liter of gasoline, and by what factors (in volume and mass) is gasoline superior?
It is hard for many people to appreciate that fossil fuels will not just "run out one day," because they don't appreciate the substantial amount of work that must go into extracting the resource from a reluctant ground. What common, day-to-day personal experiences do you imagine contributes to this disconnect? \(^{89}\)
List at least five ways in which your life benefits from fossil fuels.
A number of attempts to estimate the energy investment in our food arrive at the conclusion that every kcal of food we eat took \(10 \mathrm{kcal}^{85}\) of fossil fuel input energy, so that we are effectively eating our fossil fuels! As a sanity check, what fraction of our fossil fuel energy would have to go into food production in the U.S. if diets are typically \(2,000 \mathrm{kcal} /\) day and we use fossil fuels at a rate of \(8,000 \mathrm{~W} ?^{86}\) Does the answer seem plausible?
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