Question

¢ÙÒÔÏÂ˵·¨ÕýÈ·µÄÊÇ______
A£®µ±ÇâÔ­×Ó´Ón=4µÄ״̬ԾǨµ½n=2µÄ״̬ʱ£¬·¢Éä³ö¹â×Ó
B£®¹âµçЧӦºÍ¿µÆÕ¶ÙЧӦ¶¼½ÒʾÁ˹â¾ßÓв¨¶¯ÐÔ
C£®Ô­×Ӻ˵İëË¥ÆÚÓɺËÄÚ²¿×ÔÉíÒòËؾö¶¨£¬ÓëÔ­×ÓËù´¦µÄ»¯Ñ§×´Ì¬ºÍÍⲿÌõ¼þÎÞ¹Ø
D£®±È½áºÏÄÜÔ½´ó£¬Ô­×ÓºËÖкË×Ó½áºÏµÃÔ½Àι̣¬Ô­×ÓÔ½Îȶ¨
¢ÚÒ»ÅÚµ¯ÖÊÁ¿Îªm£¬ÒÔÒ»¶¨µÄÇã½ÇбÏòÉÏ·¢É䣬µ½´ï×î¸ßµãʱËÙ¶ÈΪv£¬ÅÚµ¯ÔÚ×î¸ßµã±¬Õ¨³ÉÁ½¿é£¬ÆäÖÐÒ»¿éÑØÔ­¹ìµÀ·µ»Ø£¬ÖÊÁ¿Îª

m

2

£®Çó£º
£¨1£©ÁíÒ»¿é±¬Õ¨ºó˲ʱµÄËٶȴóС£»
£¨2£©±¬Õ¨¹ý³ÌϵͳÔö¼ÓµÄ»úеÄÜ£®

Answer 1

¢ÙA¡¢ÇâÔ­×Ó´Ó¸ßÄܼ¶Ô¾Ç¨µ½µÍÄܼ¶£¬ÄÜÁ¿¼õС£¬ÄÜ·¢Éä³ö¹â×Ó£¬¹ÊAÕýÈ·£»
B¡¢¹âµçЧӦºÍ¿µÆÕ¶ÙЧӦ¶¼½ÒʾÁ˹â¾ßÓÐÁ£×ÓÐÔ£¬¹ÊB´íÎó£»
C¡¢·ÅÉäÐÔÔªËصİëË¥ÆÚÊÇÓɺËÄÚ×ÔÉíµÄÒòËؾö¶¨µÄ£¬ÓëÔ­×ÓËù´¦µÄ»¯Ñ§×´Ì¬Î޹أ¬¹ÊCÕýÈ·£»
D¡¢±È½áºÏÄÜÔ½´ó£¬½«ºË×Ó·Ö½âÐèÒªµÄÄÜÁ¿Ô½´ó£¬Ô­×ÓºËÖкË×Ó½áºÏµÃÔ½Àι̣¬Ô­×ÓºËÔ½Îȶ¨£¬¹ÊDÕýÈ·£®
¹ÊÑ¡ACD 
¢Ú£¨1£©±¬Õ¨ºóÑØÔ­¹ìµÀ·µ»Ø£¬Ôò¸ÃÕ¨µ¯ËٶȴóСΪv£¬·½ÏòÓëÔ­·½ÏòÏà·´ 
±¬Õ¨¹ý³Ì¶¯Á¿Êغ㣬
mv=-

m

2

v+

m

2

v₁
½âµÃv₁=3v                          
£¨2£©±¬Õ¨¹ý³ÌÖÐÖØÁ¦ÊÆÄÜûÓиı䣬±¬Õ¨Ç°ÏµÍ³×ܶ¯ÄÜ   Ek=

1

2

mv²£¬
±¬Õ¨ºóϵͳ×ܶ¯ÄÜE¡äk=

1

2

?v²+

1

2

?£¨3v£©²=2.5mv²£®
ϵͳÔö¼ÓµÄ»úеÄÜ¡÷E=E¡ä_k-E_k=2mv²£®
´ð£º¢ÙACD
¢Ú£¨1£©ÁíÒ»¿é±¬Õ¨ºó˲ʱµÄËٶȴóСv₁=3v                          
£¨2£©±¬Õ¨¹ý³ÌϵͳÔö¼ÓµÄ»úеÄÜÊÇ2mv²£®