ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾ£¬ÓÐÒ»¸ö¿ÉÊÓΪÖʵãµÄÖÊÁ¿m£½1kgµÄСÎï¿é£¬´Ó¹â»¬Æ½Ì¨ÉϵÄAµãÒÔv0£½1.8m/sµÄ³õËÙ¶ÈˮƽÅ׳ö£¬µ½´ïCµãʱ£¬Ç¡ºÃÑØCµãµÄÇÐÏß·½Ïò½øÈë¹Ì¶¨ÔÚÊúֱƽÃæÄڵĹ⻬Բ»¡¹ìµÀ£¬×îºóСÎï¿éÎÞÅöײµÄµØ»¬ÉϽô¿¿¹ìµÀÄ©¶ËDµãµÄ×ã¹»³¤µÄˮƽ´«ËÍ´ø¡£ÒÑÖª´«ËÍ´øÉϱíÃæÓëÔ²»¡¹ìµÀÄ©¶ËÇÐÏßÏàƽ£¬´«ËÍ´øÑØ˳ʱÕë·½ÏòÔÈËÙÔ˶¯µÄËÙ¶ÈΪv£½3m/s£¬Ð¡Îï¿éÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì£½0.5£¬Ô²»¡¹ìµÀµÄ°ë¾¶ÎªR£½2m£¬CµãºÍÔ²»¡µÄÔ²ÐÄOµãÁ¬ÏßÓëÊúÖ±·½ÏòµÄ¼Ð½Ç¦È£½53¡ã£¬²»¼Æ¿ÕÆø×èÁ¦£¬ÖØÁ¦¼ÓËÙ¶Èg£½10m/s2£¬sin53¡ã=0.8£¬cos53¡ã=0.6¡£Çó£º
£¨1£©Ð¡Îï¿éµ½´ïÔ²»¡¹ìµÀÄ©¶ËDµãʱ¶Ô¹ìµÀµÄѹÁ¦£»
£¨2£©Ð¡Îï¿é´Ó»¬ÉÏ´«ËÍ´øµ½µÚÒ»´ÎÀ뿪´«ËÍ´øµÄ¹ý³ÌÖвúÉúµÄÈÈÁ¿¡£
¡¾´ð°¸¡¿£¨1£©22.5N£¬·½ÏòÊúÖ±ÏòÏ¡££¨2£©Q=32J
¡¾½âÎö¡¿ÊÔÌâ·ÖÎö£º£¨1£©ÉèСÎïÌåÔÚCµãµÄËÙ¶ÈΪ£¬ÔÚCµãÓÉ£»½âµÃ
ÉèÔÚDµÄµÄËÙ¶ÈΪ£¬´ÓCµ½D£¬Óɶ¯Äܶ¨ÀíµÃ
½âµÃ
ÔÚDµãÉè¹ìµÀ¶ÔСÇòµÄ×÷ÓÃÁ¦Îª£º
½âµÃ=22.5N£»ÓÉÅ£¶ÙµÚÈý¶¨ÂÉ£¬Ð¡Çò¶Ô¹ìµÀµÄѹÁ¦´óСΪ22.5Å££¬·½ÏòÊúÖ±ÏòÏ¡£
£¨2£©ÉèÎïÌåÔÚ´«ËÍ´øÉϼÓËÙ¶ÈΪa£º
ÎïÌåÓÉDµãÏò×óÔ˶¯ÖÁËÙ¶ÈΪÁ㣬ËùÓÃʱ¼ä£¬Î»ÒÆ£º £¬
ʱ¼äÄÚ´«ËÍ´øÏòÓÒµÄλÒÆΪ£¬
ÎïÌåËÙ¶ÈÓÉÁãÔö¼Óµ½Óë´«ËÍ´øËÙ¶ÈÏàµÈ¹ý³Ì£¬ËùÓÃʱ¼ä,
ͨ¹ýµÄλÒÆ£¬ ´«ËÍ´øµÄλÒÆΪ
Сľ¿éÏà¶Ô´«ËÍ´øÒƶ¯µÄ·³ÌΪ£º £» £¬½âµÃQ=32J¡£