±±¾©Ê¯ÓÍ»¯¹¤Ñ§Ôº2026ÄêÑо¿ÉúÕÐÉú½ÓÊÕµ÷¼Á¹«¸æ
²é¿´: 2750  |  »Ø¸´: 12

Ëï?ª730

ÖÁ×ðľ³æ (ÖªÃû×÷¼Ò)

ÓÅÐã°æÖ÷

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

¡ï ¡ï ¡ï
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)

ÓÅÐã°æÖ÷

???????:
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
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ wangbin2010 µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] Ò»Ö¾Ô¸ÎäÀí³µÁ¾×¨Ë¶×Ü·Ö 281 Çóµ÷¼Á +3 Éϰ¶Ñо¿Éú. 2026-04-02 3/150 2026-04-06 16:46 by СÔ¶ùѽѽ
[¿¼ÑÐ] 305Çóµ÷¼Á +3 77Qi 2026-04-06 3/150 2026-04-06 15:36 by going home
[¿¼ÑÐ] ר˶304ÕÒµ÷¼Á£¬Ò»Ïß³ÇÊÐ×îºÃ +3 ÀîlslÀî 2026-04-05 3/150 2026-04-06 12:16 by ffffjjjj
[¿¼ÑÐ] Çóµ÷¼Á +11 ÐܶþÏëÉϰ¶ 2026-04-04 11/550 2026-04-05 22:21 by ×íÎÌwl
[¿¼ÑÐ] ²ÄÁÏ0856 Ó¢Ò»Êý¶þ 323 Çóµ÷¼Á +14 Ô¬sy 2026-04-01 14/700 2026-04-05 18:18 by cql1109
[¿¼ÑÐ] µ÷¼Á +5 ºÃºÃ¶ÁÊé¡£ 2026-04-01 5/250 2026-04-05 17:54 by liucky
[¿¼ÑÐ] 081200-11408-276ѧ˶Çóµ÷¼Á +4 ´Þwj 2026-04-04 5/250 2026-04-05 14:06 by imissbao
[¿¼ÑÐ] 085602µ÷¼Á ³õÊÔ×Ü·Ö335 +12 19123253302 2026-04-04 12/600 2026-04-05 08:08 by 544594351
[¿¼ÑÐ] ²ÄÁÏר˶322·Ö +11 ¹þ¹þ¹þºðºðºð¹þ 2026-04-02 11/550 2026-04-04 23:37 by ÓÀ×ÖºÅ
[¿¼ÑÐ] 296²ÄÁÏר˶Çóµ÷¼Á +21 202451007219 2026-04-02 22/1100 2026-04-04 21:48 by hemengdong
[¿¼ÑÐ] ÔõôɾÌû×Ó°¡ +3 ·ìêØ1000 2026-04-04 3/150 2026-04-04 14:20 by ÍÁľ˶ʿÕÐÉú
[¿¼ÑÐ] 085701Çóµ÷¼Á +7 ¹¨ÓíÃú 2026-04-04 8/400 2026-04-04 13:49 by ССÊ÷2024
[¿¼ÑÐ] 350Ò»Ö¾Ô¸±±¾©º½¿Õº½Ìì´óѧ08500²ÄÁÏ¿ÆÑ§Ó빤³ÌÇóµ÷¼Á +5 kjnasfss 2026-04-03 5/250 2026-04-03 22:29 by Î޼ʵIJÝÔ­
[¿¼ÑÐ] ÊÞÒ½µ÷¼Á +3 wh119216 2026-04-02 3/150 2026-04-03 19:34 by zrongyan
[¿¼ÑÐ] Çóµ÷¼Á +4 15064154688 2026-04-03 5/250 2026-04-03 15:07 by zrongyan
[¿¼ÑÐ] 274Çóµ÷¼Á +10 Ѧ¶¨Ú̵Ļ¢¡£ 2026-04-01 10/500 2026-04-03 10:13 by tianyyysss
[¿¼ÑÐ] 266Çóµ÷¼Á +4 ѧԱ97LZgn 2026-04-02 4/200 2026-04-02 13:03 by yulian1987
[¿¼ÑÐ] ²ÄÁÏרҵµ÷¼Á +5 À²À²À²¿Þ 2026-03-31 6/300 2026-04-01 16:48 by JourneyLucky
[¿¼ÑÐ] ¡¾µ÷¼Á¡¿Ò»Ö¾Ô¸ÏôóÉúÎïÓëÒ½Ò©µ÷¼Á +3 EchoϺÃ× 2026-03-31 3/150 2026-04-01 08:40 by JourneyLucky
[¿¼ÑÐ] 323·Ö ʳƷÓëÓªÑøµ÷¼Á +3 ºÙooo 2026-03-31 3/150 2026-03-31 09:38 by longlotian
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û