有關地科的幾個問題 - 地球科學討論

※ [本文轉錄自 ask 看板]

作者: jason761231 (jason) 看板: ask
標題: [請問] 有關地科的幾個問題
時間: Mon May 18 00:07:40 2009

先承認這是作業

只是google和知識+找很久都得不到最適合答案

所以想問板上大大

這些問題還可以用什麼關鍵字搜尋?

或是有哪些專版可以進一步得到相關資訊呢?

謝謝!

1.Please describe the major stages in the formation of the solar system and
how it evolved to its current state. Why do astronomers believe that the
solar nebula was ratating?

2.What two properties of a planet must be known in order for its average
density to be determined? How are these properties determined?

3.Please explain how the differences between the inner and the outer planets
have resulted in spite of their common origin.

4.Calculate the distance from the Sun where the temperature falls below the
freezing points of the following common ices: (a)H2O,273K; (b)CO2,150K;
(c)CH4,100K; (d)N2,70K.

5.The angular momentum of an object is proportional to the square of its size
divided by the period of rotation(D^2/P). If angular momentum is conserved,
then any change in size must be compensated for by a proportional change in
period, so as to keep D^2 divided by P a constant. Suppose that the solar
nebula gcgan with a diameter of 10,000 AU and a rotation period of 1 million
years. What would be its rotation period when it had shrunk to the size of
the orbit of Pluto? To the orbit of Jupiter? To the orbit of the Earth?

1.請描述太陽系初始時主要的組成狀態及現在的組成狀態，為什麼天文學家相信是這樣？
2.要決定一個星球的平均密度需要哪兩個數值，而這兩個數值又是如何測定？
3.請解釋類地及類木行星的不同，儘管他們的發源是同一個。
4.計算下列物質在距離太陽多少時會達到凝固點。
（a）H2O,273K ; (b)CO2,150K ; (c)CH4,100K ; (d)N2,70K
5.一個物體的角動量是和他的大小平方除以週期成正比，即（D^2/P），如果角動量守恆
，那任何大小的改變也會造成週期成比例的改變，D^2除以P也將為一個常數。假設太陽雲
氣學說開始時半徑為10,000 AU，而週期為1百萬年。當大小改變如（a）冥王星 （b）木
星 （c）地球時，週期將是多少？

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