On those cold, rainy days when you forget your rain jacket or umbrella, and you want to stay as dry as possible, should you walk and spend more time in the rain? Or should you run, which means you’ll be hitting more rain drops from the side? Assuming you haven’t been fully soaked yet, and you aren’t jumping into the puddles. The answer is simple. As you move out of the way of one falling raindrop, you move into the way of another. So the amount of the rain hitting the top of you is constant, regardless of how fast you’re going.
在那些寒冷、下雨的日子里,当你忘记带你的雨衣或雨伞而又想要尽量保持干爽时,你应该用走的,在雨中待上更多时间?或是你应该用跑的,同时也代表你会淋到更多侧边的雨滴?假设你还没有完全湿透,也不会跳进水坑。答案很简单,当你从一滴雨滴下移开,你也同时移入另一雨滴的路径。所以淋到你头顶的雨水量是固定的,不管你移动有多快。
To see this, you can picture that the raindrop themselves are stationary, and you and the earth beneath you are moving upwards through the rain. And since the volume of a parallelepiped (that’s a 3D parallelogram) doesn’t depend at all on its slant, then no matter how fast you’re moving horizontally, the same amount of rain will land on top of you each second. Now, if you’re not moving, the rain from the top is all you’ll get. But if you are moving, you’ll also run into raindrops from the side, and you’ll get wetter.
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