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?
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不會是要死算那球冠的表麵積吧?
-wxcfan123-
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08/11/2011 postreply
17:43:39
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about 4%.?
-jinjing-
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08/12/2011 postreply
09:39:17
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回複:一次流星雨能有多少人看到?
-wxcfan123-
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08/13/2011 postreply
12:05:27
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r/2(R+r)=about 4%o.Please note the tangent line.
-jinjing-
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08/13/2011 postreply
14:27:31
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0.4%?
-貧論員-
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08/15/2011 postreply
12:07:10
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Yes.Only estimat,we don't know the time,it has relation with the
-jinjing-
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08/15/2011 postreply
16:33:51
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It has relation with the rotation of the Earth.
-jinjing-
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08/15/2011 postreply
16:50:46
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sorry, youare right.
-jinjing-
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08/13/2011 postreply
14:31:26
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結果這麽clean啊!怎麽推倒出來的?
-貧論員-
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08/15/2011 postreply
11:42:51
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哦,原始推導居然用了曲麵積分。
-貧論員-
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08/15/2011 postreply
12:09:26
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不是曲麵積分。是積分求旋轉麵.
-jinjing-
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08/15/2011 postreply
16:26:28
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死算出來的。一直沒想出純幾何方法求h
-wxcfan123-
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08/15/2011 postreply
14:39:14
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You Rit. We also can use similar tringles and ...getting h(r-h)=
-jinjing-
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08/15/2011 postreply
16:44:33
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(R+r-h)^2=(R+r)^2-R^2-h^2,...
-jinjing-
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08/15/2011 postreply
17:31:02
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Sorry, It should be: (R+r-h)h=(R+r)^2-R^2-h^2,...
-jinjing-
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08/15/2011 postreply
17:33:49
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