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作者 Vulpix 在 PTT [ Physics ] 看板的留言(推文), 共1687則
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1F→:你確定你看到的力學課本正確嗎?= =03/07 12:46
13F→:長這樣:P。03/02 15:59
35F推:推herbert大,這完全是因為想一直用v代表「速度」01/11 14:25
36F→:不想換符號(事實上換符號會給自己找麻煩)而造成的。01/11 14:26
37F→:關於這點,想找例子可以去看熱力學變數...如果要換函數...01/11 14:40
38F→:不要問,很可怕,上次有個人換了,結果...01/11 14:40
1F推:只是為了需要而已,這是模擬遠處的位能很小的時候07/02 17:23
2F→:有的時候粒子只在實驗室中,那可能會要求實驗室外的位能07/02 17:25
3F→:無限大07/02 17:25
11F→:是的,夠了。地表也是起起伏伏,難道要用更精確的計算?02/19 15:08
12F→:人、動物、植物也一直動來動去,難道也要算?02/19 15:09
10F推: 回頭重看,感謝pi這麼詳盡的敘述!10/06 14:47
9F→:用小時候的說法的話,會稱其為「假想力矩」。01/20 17:00
1F→:就把x,y,z換過去啊……12/30 00:46
7F→:那不如重新用球坐標解一遍。12/30 16:10
2F推:沒錯,地球在第二個坐標系中動了,要算動能!12/12 02:11
3F→:然後讓地球質量趨近無限大即可。12/12 02:12
32F→:回答看起來不認真嗎QQ 其實g不用看成無限大12/12 12:38
33F→:因為反正我們也把地球當成平的,所以R也適當地趨近無限大就12/12 12:39
34F→:好。要比較準的話,還是用-GMm/r這種位能來算吧。12/12 12:40
35F→:然後最後再近似。12/12 12:41
1F→:你真的覺得在北極附近沿著緯線繞一圈跟在赤道跑一圈花的時12/11 21:46
2F→:一樣嗎?12/11 21:46
3F→: 間12/11 21:50