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zongyu_1986(½ð±Ò+3): ¸ÐлÄãµÄ½â´ð£¡ 2011-12-23 16:55:15
¦Ñg ¦¤h ¦Ð  R ^2 * h = 1/2*¦Ñ ¦¤h ¦Ð  R^2 *v^2 + ¦Ç v (2¦Ð r) * [¦¤h*(R/r)^2]

¦Ñr  *v^2 + 4¦Ç *v ¡ª 2¦Ñgrh = o

v={¸ùºÅ[4¦Ç^2 + 2hg(¦Ñr)^2]¡ª2¦Ç}/¦Ñr

¦¤t= (R/r)^2 * ¦¤h / v

dt= (R/r)^2 * dh / v

t=  (R/r)^2 * »ý·Ö(H,0){={¦Ñr*dh/{¸ùºÅ[4¦Ç^2 + 2hg(¦Ñr)^2]¡ª2¦Ç}}
sunyu730_emuch@126.com
11Â¥2011-11-30 19:00:31
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Ëï?ª730

ÖÁ×ðľ³æ (ÖªÃû×÷¼Ò)

ÓÅÐã°æÖ÷

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

t=  (R/r)^2  /g * {¸ùºÅ[(2¦Ç/¦Ñr)^2 + 2hg] - 2¦Ç/¦Ñr * ln{¸ùºÅ[(2¦Ç/¦Ñr)^2 + 2hg] - 2¦Ç/¦Ñr}}
sunyu730_emuch@126.com
12Â¥2011-11-30 19:27:24
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

Ëï?ª730

ÖÁ×ðľ³æ (ÖªÃû×÷¼Ò)

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???????:
12?: Originally posted by ????730 at 2011-11-30 19:27:24:
t=  (R/r)^2  /g * {????[(2??/??r)^2 + 2hg] - 2??/??r * ln{????[(2??/??r)^2 + 2hg] - 2??/??r}}

??=0,???2????
sunyu730_emuch@126.com
13Â¥2011-12-02 11:17:28
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