Physics 121 9/3/10 Prof. E. F. Redish 1 1 •Theme Music:Paul SimonWhen numbers get serious•Cartoon:Bill Waterson Calvin & Hobbes 9/3/10 Math is different in science from in math class! •Math in physics is fundamentally about relationships among measurements, not primarily about calculating – or even solving (though we do some of that). •Functional dependence is critical. “More of this means more of that” is notgood enough. How much more matters. 9/3/10 7 An example from a math exam •Writing the equation in this problem on a physics exam would receive 0 credit and the comment: “This is a meaningless equation!” The population density of trout in a stream is where ris measured in trout per mile and x is measured in miles. xruns from 0 to 10. (a) Write an expression for the total number of trout in the stream. Do not compute it. 9/3/10 8 r(x)=201+xx2+1How would you fix this?
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