"船隻能否立即剎掣?"
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船隻能否立即剎掣?
2009-06-09 3:24 am
回答 (2)
2009-06-11 3:19 am
✔ 最佳答案
不能...如果要將船剎停....就要有一個方向相反既力...力既定義係F(力)=m(質量).a(加速度) .....其中a可以換成
(mv-mu)/t 所以t(時間)小，力就大。
如果要立即剎停船的話....即係t=0 ......力會冇限大....所以理論上係唔得既。
2009-06-09 4:41 am
Any moving object must follow the laws of mechanics. As such, a ship with a certain velocity needs a distance to stop completely eventhough its decceleration can be greatly achieved using reverse propellent.
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090608000051KK01554