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Should you run or walk when you have to cross the street in the rain without an umbrella? Running means spending less time in the rain, but, on the other hand, since you are running into some rain, you might end up wetter than if you has walked. Try to do a rough calculation, taking your body as a rectangular object. Using such a model, can you tell if your answer (whether to run or walk) depends on whether the rain is falling vertically or at a slant?
To simplify the problem, let us assume you are wearing a rainhat and need not worry about the rain on your head. If the rain is toward your front or directly overhead, then you should run as fas as possible to shelter. If, however, the rain in on your back, then you should run with a speed equal to de horizontal velocity of the rain, that is, along with the rain.
Should you run or walk when you have to cross the street in the rain without an umbrella? Running means spending less time in the rain, but, on the other hand, since you are running into some rain, you might end up wetter than if you has walked. Try to do a rough calculation, taking your body as a rectangular object. Using such a model, can you tell if your answer (whether to run or walk) depends on whether the rain is falling vertically or at a slant?
To simplify the problem, let us assume you are wearing a rainhat and need not worry about the rain on your head. If the rain is toward your front or directly overhead, then you should run as fas as possible to shelter. If, however, the rain in on your back, then you should run with a speed equal to de horizontal velocity of the rain, that is, along with the rain.
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Prof. Sérgio Torres