Re: [請益] 請問光速與黑洞間的計算
: → HuangJC:你沒看懂的那段是我的重點.. 04/24 23:08
: → Equalmusic:XD 04/25 00:43
: → Equalmusic:阿我看懂了, 你說的那個條件已經不同了 04/25 01:41
: → Equalmusic:你的物件有持續受力, 計算脫離速度時物體是沒受力的 04/25 01:41
: 推 HuangJC:所以我很簡單的說,要脫離地球到達月球不必有第幾宇宙速度 04/25 03:46
: → HuangJC:我幹麻一定要旋轉,切線施力;同理光脫離重力又何必切線計算 04/25 03:47
: → HuangJC:而既然不必切線計算,又憑什麼引用那個公式? 04/25 03:47
你...整個搞錯了 XD
需要脫離地球重力場的最小能量是固定的(這沒問題吧?)
也就是最小動能是固定的 -> 質量是固定的 -> 速度是固定的
也就是脫離速度是任何物體需要脫離地球重力場的最小速度
而這個前提, 是這個物體沒有受到任何外力
至於你說的那個施力讓他慢慢來不是不行, 但那是有外力介入的情況下
比如太空船登月之類的, 就是用這種方式, 不然瞬間加速人都壓死了
而光脫離重力當然是用沒有外力介入的方法計算
(當然如果有上帝, 用手把一顆光子從黑洞裡慢慢拉出來那當然也可以 XD)
至於你說什麼旋轉什麼切線施力那都不是重點...重點在於能量要守恆
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