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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Get started for freeA 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?
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?
Let's say that Earth was originally endowed with one million flerbits, \({ }^{87}\) and that we have already used up 400,000 of them. We currently extract 15,000 per year. How long does the \(\mathrm{R} / \mathrm{P}\) ratio suggest the resource will last?
A gallon of gasoline contains about \(37 \mathrm{kWh}\) of energy and costs about \(\$ 4\), while a typical AA battery holds about \(0.003 \mathrm{kWh}\) and costs about \(\$ 0.50\) each, in bulk. By what factor are batteries more expensive, for the same amount of energy?
Proven remaining reserves of oil, gas, and coal are 10,8, and \(20 \mathrm{ZJ},{ }^{88}\) while we have used 8,4, and \(8 \mathrm{ZJ}\) of each. What fraction of the original total fossil fuel resource have we already used, then?
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