ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬Õæ¿ÕÊÒÄÚÊúÖ±ÌõÐÎÇøÓòI´æÔÚ´¹Ö±Ö½ÃæÏòÍâµÄÔÈÇ¿´Å³¡£¬ÌõÐÎÇøÓò¢ò£¨º¬I¡¢¢òÇøÓò·Ö½çÃ棩´æÔÚˮƽÏòÓÒµÄÔÈÇ¿µç³¡£¬µç³¡Ç¿¶ÈΪE£¬´Å³¡ºÍµç³¡¿í¶È¾ùΪlÇÒ×ã¹»³¤£¬M¡¢NΪͿÓÐÓ«¹âÎïÖʵÄÊúÖ±°å¡£ÏÖÓÐÒ»ÊøÖÊ×Ó´ÓA´¦Á¬Ðø²»¶ÏµØÉäÈë´Å³¡£¬ÈëÉä·½ÏòÓëM°å³É60¡ã¼Ð½ÇÇÒÓëÖ½ÃæƽÐÐÈçͼ¡£ÖÊ×ÓÊøÓÉÁ½²¿·Ö×é³É£¬Ò»²¿·ÖΪËٶȴóСΪvµÄµÍËÙÖÊ×Ó£¬ÁíÒ»²¿·ÖΪËٶȴóСΪ3vµÄ¸ßËÙÖÊ×Ó£¬µ±IÇøÖдų¡½Ïǿʱ£¬M°å³öÏÖÁ½¸öÁÁ°ß£¬»ºÂý¸Ä±ä´Å³¡Ç¿Èõ£¬Ö±ÖÁÁÁ°ßÏà¼Ì¸ÕºÃÏûʧΪֹ£¬´Ëʱ¹Û²ìµ½N°åÓÐÁ½¸öÁÁ°ß¡£ÒÑÖªÖÊ×ÓÖÊÁ¿Îªm£¬µçÁ¿Îªe£¬²»¼ÆÖÊ×ÓÖØÁ¦ºÍÏ໥×÷ÓÃÁ¦£¬Çó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241431425813861.jpg)
£¨1£©´ËʱIÇøµÄ´Å¸ÐӦǿ¶È£»
£¨2£©N°åÁ½¸öÁÁ°ßÖ®¼äµÄ¾àÀë¡£
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241431425813861.jpg)
£¨1£©´ËʱIÇøµÄ´Å¸ÐӦǿ¶È£»
£¨2£©N°åÁ½¸öÁÁ°ßÖ®¼äµÄ¾àÀë¡£
£¨1£©3mv£¯2el£¨2£©
v
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143142596445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143142643598.png)
£¨1£©µÍËÙÖÊ×ÓÔ˶¯¹ì¼£Óë½çÃæÏàÇУ¬µÃ°ë¾¶r£½2l£¯3 3·Ö
ÓÉevB£½mv2£¯r 3·Ö
µÃB£½3mv£¯2el 2·Ö
£¨2£©¸ßËÙÖÊ×ÓÔ˶¯°ë¾¶r¡ä£½2l£¬Ô˶¯ÖÁÇøÓò½çÃ棬Ëٶȷ½ÏòÓë½çÃæ´¹Ö±
µÍËÙÖÊ×ÓÔڵ糡ÖУ¬Ñص糡·½Ïò×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÔ˶¯£¬Î»ÒÆl£½
3·Ö
´¹Ö±µç³¡·½ÏòÉÏ×öÔÈËÙÖ±ÏßÔ˶¯£¬Î»ÒÆy£½vt 3·Ö
ËùÒÔN°åÁ½¸öÁÁ°ßÖ®¼äµÄ¾àÀëY£½rcos30¡ã£«y 3·Ö
½âµÃY£½
v
2·Ö
±¾Ì⿼²é´øµçÁ£×ÓÔÚ¸´ºÏ³¡ÖеÄÔ˶¯£¬Ôڴų¡ÖÐÓÉÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦£¬»³öÔ˶¯¹ì¼££¬ÏÈÕÒÔ²ÐÄ£¬Óɼ¸ºÎ¹ØϵÇóµÃ°ë¾¶£¬ÔÙÓɰ뾶¹«Ê½r=mv/qBÇóµÃ´Å¸ÐÇ¿¶È£¬½øÈëµç³¡ºó£¬°ÑÁ£×ÓµÄËٶȷֽ⣬ÔÚÑØ×ŵ糡·½ÏòÁ£×Ó×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÔ˶¯£¬´¹Ö±µç³¡·½ÏòËÙ¶ÈΪÁ㣬ÓÉÀàƽÅ×Ô˶¯Çó½â
ÓÉevB£½mv2£¯r 3·Ö
µÃB£½3mv£¯2el 2·Ö
£¨2£©¸ßËÙÖÊ×ÓÔ˶¯°ë¾¶r¡ä£½2l£¬Ô˶¯ÖÁÇøÓò½çÃ棬Ëٶȷ½ÏòÓë½çÃæ´¹Ö±
µÍËÙÖÊ×ÓÔڵ糡ÖУ¬Ñص糡·½Ïò×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÔ˶¯£¬Î»ÒÆl£½
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143142690627.png)
´¹Ö±µç³¡·½ÏòÉÏ×öÔÈËÙÖ±ÏßÔ˶¯£¬Î»ÒÆy£½vt 3·Ö
ËùÒÔN°åÁ½¸öÁÁ°ßÖ®¼äµÄ¾àÀëY£½rcos30¡ã£«y 3·Ö
½âµÃY£½
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143142596445.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143142643598.png)
±¾Ì⿼²é´øµçÁ£×ÓÔÚ¸´ºÏ³¡ÖеÄÔ˶¯£¬Ôڴų¡ÖÐÓÉÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦£¬»³öÔ˶¯¹ì¼££¬ÏÈÕÒÔ²ÐÄ£¬Óɼ¸ºÎ¹ØϵÇóµÃ°ë¾¶£¬ÔÙÓɰ뾶¹«Ê½r=mv/qBÇóµÃ´Å¸ÐÇ¿¶È£¬½øÈëµç³¡ºó£¬°ÑÁ£×ÓµÄËٶȷֽ⣬ÔÚÑØ×ŵ糡·½ÏòÁ£×Ó×ö³õËÙ¶ÈΪÁãµÄÔȼÓËÙÔ˶¯£¬´¹Ö±µç³¡·½ÏòËÙ¶ÈΪÁ㣬ÓÉÀàƽÅ×Ô˶¯Çó½â
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿