**Question:****You are caught without an umbrella in the rain and wish to get to your ****dorm, 1 km away, in the driest possible condition. Should you walk or run? ****To answer this question, calculate the ratio of the rain drop collisions with ****your body under the two conditions. Assume that the cross section is inde****pendent of direction (i.e., that you are spherical), that you run at 8 m/s , ****you walk at 3 m/s , and that the rainfall is constant with a velocity of, say, ****15 m/s .**

**This is the problem 1.14 of the book "Chemical Kinetics and Reaction Dynamics, written by Paul L. Houston".**

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