地球的半徑為6400公裏。流星在離地麵50公裏時由於跟大氣摩擦開始燃燒發光所以我們能見到。一般在離地麵40公裏時就已經燒光了。
地麵上能看到流星的地方有多大?
地球的半徑為6400公裏。流星在離地麵50公裏時由於跟大氣摩擦開始燃燒發光所以我們能見到。一般在離地麵40公裏時就已經燒光了。
地麵上能看到流星的地方有多大?
• 不會是要死算那球冠的表麵積吧? -wxcfan123- ♂ (0 bytes) () 08/11/2011 postreply 17:43:39
• about 4%.? -jinjing- ♀ (0 bytes) () 08/12/2011 postreply 09:39:17
• 回複:一次流星雨能有多少人看到? -wxcfan123- ♂ (271 bytes) () 08/13/2011 postreply 12:05:27
• r/2(R+r)=about 4%o.Please note the tangent line. -jinjing- ♀ (0 bytes) () 08/13/2011 postreply 14:27:31
• 0.4%? -貧論員- ♀ (0 bytes) () 08/15/2011 postreply 12:07:10
• Yes.Only estimat,we don't know the time,it has relation with the -jinjing- ♀ (0 bytes) () 08/15/2011 postreply 16:33:51
• It has relation with the rotation of the Earth. -jinjing- ♀ (0 bytes) () 08/15/2011 postreply 16:50:46
• sorry, youare right. -jinjing- ♀ (0 bytes) () 08/13/2011 postreply 14:31:26
• 結果這麽clean啊!怎麽推倒出來的? -貧論員- ♀ (0 bytes) () 08/15/2011 postreply 11:42:51
• 哦,原始推導居然用了曲麵積分。 -貧論員- ♀ (19 bytes) () 08/15/2011 postreply 12:09:26
• 不是曲麵積分。是積分求旋轉麵. -jinjing- ♀ (203 bytes) () 08/15/2011 postreply 16:26:28
• 死算出來的。一直沒想出純幾何方法求h -wxcfan123- ♂ (219 bytes) () 08/15/2011 postreply 14:39:14
• You Rit. We also can use similar tringles and ...getting h(r-h)= -jinjing- ♀ (0 bytes) () 08/15/2011 postreply 16:44:33
• (R+r-h)^2=(R+r)^2-R^2-h^2,... -jinjing- ♀ (0 bytes) () 08/15/2011 postreply 17:31:02
• Sorry, It should be: (R+r-h)h=(R+r)^2-R^2-h^2,... -jinjing- ♀ (0 bytes) () 08/15/2011 postreply 17:33:49
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