ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿2022Ä꽫ÔÚÎÒ¹ú¾Ù°ìµÚ¶þÊ®ËĽ춬°Â»á£¬Ìø̨»¬Ñ©ÊÇÆäÖÐ×î¾ß¹ÛÉÍÐÔµÄÏîÄ¿Ö®Ò»¡£Ä³»¬µÀʾÒâͼÈçÏ£¬³¤Ö±Öú»¬µÀABÓëÍäÇú»¬µÀBCƽ»¬Ïνӣ¬AB¶ÎµÄ³¤¶ÈL=100 m£¬Óëˮƽ·½ÏòµÄ¼Ð½Ç¦È =30¡£»¬µÀBC¸ßh=10 m£¬CÊǰ뾶R=60 mÔ²»¡µÄ×îµÍµã¡£ÖÊÁ¿m=60 kgµÄÔ˶¯Ô±´ÓA´¦Óɾ²Ö¹¿ªÊ¼ÔȼÓËÙÏ»¬£¬µ½´ïBµãʱËÙ¶ÈvB=30 m/s¡£È¡ÖØÁ¦¼ÓËÙ¶Èg=10 m/s2¡£
£¨1£©ÇóÔ˶¯Ô±ÔÚÖú»¬µÀAB¶ÎÏ»¬¹ý³ÌÊܵ½µÄ»¬¶¯Ä¦²ÁÁ¦µÄ´óС£»
£¨2£©Èô²»¼ÆBC¶ÎµÄ×èÁ¦£¬ÇóÔ˶¯Ô±¾¹ýCµãʱÊܵ½µÄÖ§³ÖÁ¦µÄ´óС¡£
¡¾´ð°¸¡¿£¨1£©30N£»£¨2£©1700N
¡¾½âÎö¡¿
£¨1£©Ô˶¯Ô±ÔÚAB¶ÎÔȼÓËÙÏ»¬£¬ÓÐ
¢Ù
ÓÉÅ£¶ÙÔ˶¯¶¨ÂɿɵÃ
¢Ú
´úÈëÊý¾Ý½âµÃ»¬¶¯Ä¦²ÁÁ¦µÄ´óС
f = 30N ¢Û
£¨2£©Ô˶¯Ô±´ÓBµãÔ˶¯µ½Cµã¹ý³Ì£¬ÓÉ»úеÄÜÊغ㶨ÂɿɵÃ
¢Ü
¾¹ýCµãʱ£¬ÓÐ
¢Ý
´úÈëÊý¾Ý½âµÃÔ˶¯Ô±¾¹ýCµãʱÊܵ½µÄÖ§³ÖÁ¦µÄ´óС
¢Þ

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿