µ±Ç°Î»ÖãºÊ×Ò³ > ½ËÕÊ¡ÑïÖÝÖÐѧ2019-2020ѧÄêµÚ¶þѧÆÚ¸ßÒ»ÎïÀí5ÔÂÔ¿¼
£¨1£©Èç¹û»¬¿éÇ¡ºÃÄܾPµã·É³ö£¬ÎªÁËʹ»¬¿éÇ¡ºÃÑØABÐ±Ãæ½øÈë¹øÄÚ£¬Ó¦µ÷½Ú¹øµ×Ö§¼Ü¸ß¶ÈÊ¹Ð±ÃæµÄA¡¢DµãÀëµØ¸ßΪ¶àÉÙ£¿
£¨2£©½Ó£¨1£©ÎÊ£¬Ç󻬿éÔÚ¹øÄÚÐ±ÃæÉÏͨ¹ýµÄ×Ü·³Ì£®
£¨3£©¶Ô»¬¿éµÄ²»Í¬³õËÙ¶È£¬ÇóÆäͨ¹ý×î¸ßµãPºÍСԲ»¡×îµÍµãQʱÊÜѹÁ¦Ö®²îµÄ×îСֵ£®¡¾´ð°¸¡¿£¨1£©h?3R?¡¾½âÎö¡¿
vy22g?221R39£¨3£©9mg R£¨2£©s?1616mvP2ÊÔÌâ·ÖÎö£º£¨1£©ÔÚPµãmg?µÃvP?2gR 2Rµ½´ïAµãʱËÙ¶È·½Ïò񻄯×ÅAB£¬vy?vp.tan??ËùÒÔADÀëµØ¸ß¶ÈΪh?3R?32gR 4vy22g?39R 16£¨2£©½øÈëAµã»¬¿éµÄËÙ¶ÈΪv?vP5?2gR cos?4¼ÙÉè¾¹ýÒ»¸öÀ´»ØÄܹ»»Øµ½Aµã£¬Éè»ØÀ´Ê±¶¯ÄÜΪEk£¬
12mv?4?mgcos?8R?0ËùÒÔ»¬¿é²»»á»¬µ½A¶ø·É³ö£® 212¸ù¾Ý¶¯Äܶ¨Àímg2Rsin???mgcos?s?0?mv
2221R µÃ»¬¿éÔÚ¹øÄÚÐ±ÃæÉÏ×ß¹ýµÃ×Ü·³Ìs?16Ek?£¨3£©Éè³õËÙ¶È¡¢×î¸ßµãËÙ¶È·Ö±ðΪv1¡¢v2
mv12 ÓÉÅ£¶þ¶¨ÂÉ£¬ÔÚQµãF1?mg?R2mv2 ÔÚPµãF2?mg?2R22m(2v12?2v2?v2) ËùÒÔF1?F2?2mg?2RÓÉ»úеÄÜÊØºã
1212mv1?mv2?mg3R 2222µÃv1?v2?6gRΪ¶¨Öµ
´øÈëv2µÄ×îСֵ2gRµÃѹÁ¦²îµÄ×îСֵΪ9mg
¹²·ÖÏí92ƪÏà¹ØÎĵµ