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绕球绳子接长1米,绳圈离球面多少? [复制链接]

透魔

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发表于 2008-5-11 15:17:16 |只看该作者
<>黑色圆环代表地球周长。</P>
<>红色圆环代表加长1米后绳子的周长。</P>
<><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT color=#000000>R——地球半径</FONT></SPAN></P>
<><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT color=#000000><SPAN style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-family: 'Times New Roman'">△</SPAN><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">R——待求值</SPAN></FONT></SPAN></P>
<><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT color=#000000><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"> yuan.JPG </SPAN></FONT></SPAN></P><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><FONT color=#000000><SPAN lang=EN-US style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-fareast-font-family: 宋体; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">
< class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">π</SPAN><SPAN lang=EN-US>(R+</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">△</SPAN><SPAN lang=EN-US>R)- 2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">π</SPAN><SPAN lang=EN-US>R=<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-comffice:smarttags" /><st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="100" UnitName="cm">100cm</st1:chmetcnv></SPAN></P>
< class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">△</SPAN><SPAN lang=EN-US>R=100/2</SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">π</SPAN><SPAN lang=EN-US>=<st1:chmetcnv w:st="on" TCSC="0" NumberType="1" Negative="False" HasSpace="False" SourceValue="15.92" UnitName="cm">15.92cm</st1:chmetcnv></SPAN></P>
<></SPAN></FONT></SPAN>&nbsp;</P>

[ 本帖最后由 bbshanwei 于 2008-5-11 15:19 编辑 ]

yuan.JPG (10.62 KB, 下载次数: 28)

yuan.JPG

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银魔

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论坛建设奖 爱心大使 八年元老

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发表于 2008-5-12 11:53:34 |只看该作者
红舞,你怎么写的这么麻烦?和地球的直径无关,距离为100/2π=15.92cm,完了
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透魔

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发表于 2008-5-12 19:50:45 |只看该作者
我是解释的比较详细些,这是个完整的计算过程,你凭空搞个公式出来很难理解的。
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发表于 2008-5-18 11:37:58 |只看该作者
<P>恩,红舞已经计算得很详细了,其实增加1米的绳子只是影响到了半径的增量,与半径本身无关,所以无论大球小球半径的增量是相同的。</P>
<P>&nbsp;</P>
<P>如果题目改为:“用绳子在离地球表面1米之外将其围住,问绳子的长度与地球周长之差?”相信结果同样让大家大吃一惊,才6.28米。想想它们都近似平行了,增量很小也可以理解,呵呵!</P>

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