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Gruszka, T. 1994. A Balloon Experiment in the Classroom. *The College Mathematics Journal*. 25(5): 442-444.

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“The following experiment involves a balloon, a stopwatch, and a measurement device such as a meter stick. . . . The goals of the experiment include fostering student participation, solving differential equations, dealing with parameters, comparing theory with experiment, and writing a group report.

Students solve the differential equations analytically in each case (i) – (iii) and from the distance the balloon fell (known!) and the time it takes to strike the floor (known!) the parameters k and r, the power of velocity in *F(v)* = *kv ^{r}* in the differential equation, can be ascertained.

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