神奇的管子
小泽前往W国。W国的小叶展示一直径5厘米的金属制管说道:"我们国内的水管皆以此物体制成",小泽不解遒:"它管径如此细小,何能翰送水?""它1分钟可输送10吨以上的水呢!"小叶答说。 "是否将其绑成一束来使用呢?"不! 仅使用一根。"究竟是何道理呢?
1 / (pi * 0.025^2 * 60) = 8.48 (m / s) Sending water at this speed is not unreasonable. |
if it is, then would need 10 times of 8.48m/s, which is 84.8m/s. That's quite a powerful water jet. I guess one way to do this is to bend the tube into a tight spiral, ie it becomes the wall of a larger tube. I don't know if there is an easy way to make it waterproof. |
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