Estimating gas mileage: An example of order-of-magnitude physics
Sanjoy Mahajan
Abstract
I discuss how to estimate the gas mileage of a car. This discussion, which covers air resistance and Reynolds numbers, describes one way to introduce dimensional analysis and order-of-magnitude physics into introductory physics (if only the syllabus would allow it). It is part teacher's guide and part textbook chapter -- I hope not the worst parts of each.
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