ÌâÄ¿ÄÚÈÝ
Èçͼ¼×Ëùʾ£¬±íÃæ¾øÔµ¡¢Çã½Ç¦È=30¡ãµÄбÃæ¹Ì¶¨ÔÚˮƽµØÃæÉÏ£¬Ð±ÃæËùÔÚ¿Õ¼äÓÐÒ»¿í¶ÈD=0.40mµÄÔÈÇ¿´Å³¡ÇøÓò£¬Æä±ß½çÓëбÃæµ×±ßƽÐУ¬´Å³¡·½Ïò´¹Ö±Ð±ÃæÏòÉÏ£®Ò»¸öÖÊÁ¿m=0.10kg¡¢×ܵç×èR=0.25WµÄµ¥ÔѾØÐνðÊô¿òabcd£¬·ÅÔÚбÃæµÄµ×¶Ë£¬ÆäÖÐab±ßÓëбÃæµ×±ßÖغϣ¬ab±ß³¤L=0.50m£®´Ót=0ʱ¿Ì¿ªÊ¼£¬Ïß¿òÔÚ´¹Ö±cd±ßÑØбÃæÏòÉÏ´óСºã¶¨µÄÀÁ¦×÷ÓÃÏ£¬´Ó¾²Ö¹¿ªÊ¼Ô˶¯£¬µ±Ïß¿òµÄab±ßÀ뿪´Å³¡ÇøÓòʱ³·È¥ÀÁ¦£¬Ïß¿ò¼ÌÐøÏòÉÏÔ˶¯£¬Ïß¿òÏòÉÏÔ˶¯¹ý³ÌÖÐËÙ¶ÈÓëʱ¼äµÄ¹ØϵÈçͼÒÒËùʾ£®ÒÑÖªÏß¿òÔÚÕû¸öÔ˶¯¹ý³ÌÖÐʼÖÕδÍÑÀëбÃ棬ÇÒ±£³Öab±ßÓëбÃæµ×±ßƽÐУ¬Ïß¿òÓëбÃæÖ®¼äµÄ¶¯Ä¦²ÁÒòÊý
£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡10 m/s2£®Çó£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500524093814903.png)
£¨1£©Ïß¿òÊܵ½µÄÀÁ¦FµÄ´óС£»
£¨2£©ÔÈÇ¿´Å³¡µÄ´Å¸ÐӦǿ¶ÈBµÄ´óС£»
£¨3£©Ïß¿òÔÚбÃæÉÏÔ˶¯µÄ¹ý³ÌÖвúÉúµÄ½¹¶úÈÈQ£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005240922484.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500524093814903.png)
£¨1£©Ïß¿òÊܵ½µÄÀÁ¦FµÄ´óС£»
£¨2£©ÔÈÇ¿´Å³¡µÄ´Å¸ÐӦǿ¶ÈBµÄ´óС£»
£¨3£©Ïß¿òÔÚбÃæÉÏÔ˶¯µÄ¹ý³ÌÖвúÉúµÄ½¹¶úÈÈQ£®
£¨1£©F="1.5" N£¨2£©
£¨3£©![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005240969534.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005240953519.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005240969534.png)
ÊÔÌâ·ÖÎö£º£¨1£©ÓÉv-tͼÏó¿ÉÖª£¬ÔÚ0¡«0.4sʱ¼äÄÚÏß¿ò×öÔȼÓËÙÖ±ÏßÔ˶¯£¬½øÈë´Å³¡Ê±µÄËÙ¶ÈΪv1=2.0m/s£¬ËùÒÔ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005240984541.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005241000870.png)
Áª½â¢Ù¢Ú´úÈëÊý¾ÝµÃ£º
F="1.5" N ¡¡¡¡¡¡¢Û
£¨2£©ÓÉv-tͼÏó¿ÉÖª£¬Ïß¿ò½øÈë´Å³¡ÇøÓòºóÒÔËÙ¶Èv1×öÔÈËÙÖ±ÏßÔ˶¯£¬ÓÉ·¨ÀµÚµç´Å¸ÐÓ¦¶¨ÂɺÍÅ·Ä·¶¨ÂÉÓУºE=BLv1¡¢Ü
ÓÉÅ·Ä·¶¨Âɵãº
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005241016514.png)
¶ÔÓÚÏß¿òÔÈËÙÔ˶¯µÄ¹ý³Ì£¬ÓÉÁ¦µÄƽºâÌõ¼þÓУº
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052410311143.png)
Áª½â¢Ü¢Ý¢Þ´úÈëÊý¾ÝµÃ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005240953519.png)
£¨3£©ÓÉv-tͼÏó¿ÉÖª£¬Ïß¿ò½øÈë´Å³¡ÇøÓòºó×öÔÈËÙÖ±ÏßÔ˶¯£¬²¢ÒÔËÙ¶Èv1ÔÈËÙ´©³ö´Å³¡£¬ËµÃ÷Ïß¿òµÄ¿í¶ÈµÈÓڴų¡µÄ¿í¶È£¬¼´Îª£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005241062604.png)
Ïß¿òÔÚ¼õËÙΪÁãʱ£¬ÓУº
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005241078882.png)
ËùÒÔÏß¿ò²»»áÏ»¬£¬ÉèÏß¿ò´©¹ý´Å³¡µÄʱ¼äΪt£¬Ôò£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005241094538.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005241109566.png)
Áª½â¢Ü¢Ý¢Þ´úÈËÊý¾ÝµÃ£º
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005240969534.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿