Physics

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http://www.ugrad.math.ubc.ca/coursedoc/math100/notes/diffeqs/cool.html

Newton's Law of Cooling

We have examined the behaviour of two simple differential equations so far, one for population growth, and one for the radioactive decay of a substance. The methods we have developed are actually useful for many other interesting problems, and can help us to make predictions about other systems that, at first sight, do not seem at all related. We will find that the common thread in all these systems is the simple differential equation of the form