ÌâÄ¿ÄÚÈÝ
[ÎïÀí¡ªÑ¡ÐÞ3£5]£¨15·Ö£©
£¨1£©£¨5·Ö£©ÏÂÁÐ˵·¨ÖдíÎóµÄÊÇ £¨¡¡¡¡£©
A£®Â¬Éª¸£Í¨¹ýʵÑé·¢ÏÖÁËÖÊ×ӵĺ˷´Ó¦·½³ÌΪHe£«N¡úO£«H
B£®Ó˺ËÁѱäµÄºË·´Ó¦ÊÇ£ºU¡úBa£«Kr£«2n
C£®ÖÊ×Ó¡¢ÖÐ×Ó¡¢¦ÁÁ£×ÓµÄÖÊÁ¿·Ö±ðΪm1¡¢m2¡¢m3£¬ÖÊ×ÓºÍÖÐ×Ó½áºÏ³ÉÒ»¸ö¦ÁÁ£×Ó£¬ÊͷŵÄÄÜÁ¿ÊÇ£¨2m1£«2m2£m3£©c2
D£®Ô×Ó´ÓaÄܼ¶×´Ì¬Ô¾Ç¨µ½bÄܼ¶×´Ì¬Ê±·¢É䲨³¤Îª¦Ë1µÄ¹â×Ó£»Ô×Ó´ÓbÄܼ¶×´Ì¬Ô¾Ç¨µ½cÄܼ¶×´Ì¬Ê±ÎüÊÕ²¨³¤Îª¦Ë2µÄ¹â×Ó£¬ÒÑÖª¦Ë1>¦Ë2£¬ÄÇôÔ×Ó´ÓaÄܼ¶×´Ì¬Ô¾Ç¨µ½cÄܼ¶×´Ì¬Ê±½«ÒªÎüÊÕ²¨³¤ÎªµÄ¹â×Ó
£¨2£©£¨10·Ö£©ÈçͼËùʾ£¬ÖÊÁ¿M£½0£®040kgµÄ°ÐºÐA¾²Ö¹Ôڹ⻬ˮƽµ¼¹ìÉϵÄOµã£¬Ë®Æ½ÇáÖʵ¯»ÉÒ»¶Ë˨Ôڹ̶¨µ²°åPÉÏ£¬ÁíÒ»¶ËÓë°ÐºÐAÁ¬½Ó¡£Q´¦ÓÐÒ»¹Ì¶¨µÄ·¢ÉäÆ÷B£¬Ëü¿ÉÒÔÃé×¼°ÐºÐ·¢ÉäÒ»¿ÅˮƽËÙ¶ÈΪv0£½50m/s£¬ÖÊÁ¿m£½0£®010kgµÄµ¯Í裬µ±µ¯Íè´òÈë°ÐºÐAºó£¬±ãÁôÔÚºÐÄÚ£¬Åöײʱ¼ä¼«¶Ì¡£²»¼Æ¿ÕÆø×èÁ¦¡£
Ç󣺵¯Íè½øÈë°ÐºÐAºó£¬µ¯»ÉµÄ×î´óµ¯ÐÔÊÆÄÜΪ¶àÉÙ£¿
£¨ÎïÀíÑ¡ÐÞ3£5£©£¨15·Ö£©
¡¾½âÎö¡¿£¨1£©£¨5·Ö£©B
£¨2£©£¨10·Ö£©£¨1£©µ¯Íè½øÈë°ÐºÐAºó£¬µ¯ÍèÓë°ÐºÐAµÄ¹²Í¬ËÙ¶ÈÉèΪv£¬ÓÉϵͳ¶¯Á¿ÊغãµÃ mv0£½£¨m£«M£©v£¨3·Ö£©
°ÐºÐAµÄËٶȼõΪÁãʱ£¬µ¯»ÉµÄµ¯ÐÔÊÆÄÜ×î´ó£¬ÓÉϵͳ»úеÄÜÊغãµÃ
Ep£½£¨m£«M£©v2£¨3·Ö£© ½âµÃEp£½v£¨2·Ö£©
´úÈëÊýÖµµÃ Ep£½2£®5J£¨2·Ö£©
[ÎïÀí¡ª¡ªÑ¡ÐÞ3£5](15·Ö)
¡¾Ð¡Ìâ1¡¿¡°³¯ºËΣ»ú¡±ÒýÆðÈ«ÇòÖõÄ¿£¬Æä½¹µã¾ÍÊdz¯Ïʺ˵çÕ¾²ÉÓÃÇáË®¶Ñ»¹ÊÇÖØË®¶Ñ£®ÖØË®¶ÑºËµçÕ¾ÔÚ·¢µçµÄͬʱ»¹¿ÉÒÔÉú²ú³ö¿É¹©ÑÐÖƺËÎäÆ÷µÄîÐ239£¨Pu£©£¬ÕâÖÖîÐ239¿ÉÓÉÓË239£¨U£©¾¹ýn´Î¦ÂË¥±ä¶ø²úÉú£¬ÔònΪ
A£®2 | B£®239 | C£®145 | D£®92 |
£¨1£©ÎïÌåÔÚÒÒ³µÉϱíÃ滬Ðж೤ʱ¼äÏà¶ÔÒÒ³µ¾²Ö¹£»
£¨2£©Îï¿é×îÖÕ¾àÀëÒÒ³µ×ó¶Ë¶à´ó¾àÀë.