又算错,周期T约=85分.

回答: a hole on earth:jinjing2011-09-13 18:01:55

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84 -guest007- 给 guest007 发送悄悄话 (148 bytes) () 09/15/2011 postreply 09:56:00

Thx, my earth radius is too long ,if it is 6370km,the answer is -jinjing- 给 jinjing 发送悄悄话 (59 bytes) () 09/15/2011 postreply 10:16:25

6370/6400*85=84 -jinjing- 给 jinjing 发送悄悄话 (0 bytes) () 09/15/2011 postreply 10:17:40

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