Question

ÈçͼËùʾ£¬Äڱڹ⻬µÄľ²ÛÖÊÁ¿Îªm_A= m,ÄÚÖ±¾¶Îª2L£¬ÖÃÓÚˮƽ×ÀÃæÉÏ,²ÛÓë×ÀÃæ¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì.²ÛÄÚÓÐÁ½¸öСÇòB¡¢C£¬ËüÃǵÄÖÊÁ¿·Ö±ðÊÇm_B = m£¬m_C="2" m .ÏÖÓÃÁ½Çò½«ºÜ¶ÌµÄÇᵯ»Éѹ½ô(ÇòÓ뵯»É²»Á¬½Ó)£¬ÇÒBÇòµ½Ä¾²Û×ó¶Ë¡¢CÇòµ½Ä¾²ÛÓҶ˵ľàÀë¾ùΪL£¬Õâʱµ¯»ÉµÄµ¯ÐÔÊÆÄÜΪE_P = ¦ÌmgL.ͬʱÊÍ·ÅB¡¢CÇò£¬²¢¼ÙÉèСÇòÓë²ÛÅöײºó²»·ÖÀë,Åöײʱ¼ä²»¼Æ.Çó£º

СÌâ1:µÚ1¸öСÇòÓë²ÛÅöײºóµÄ¹²Í¬Ëٶȣ¿
СÌâ2:µÚ2¸öСÇòÓë²ÛÅöײºóµÄ¹²Í¬Ëٶȣ¿
СÌâ3:Õû¸öÔ˶¯¹ý³ÌÖУ¬×ÀÃæÓë²ÛĦ²Á²úÉúµÄÈÈÁ¿£¿

Answer 1

СÌâ1:
СÌâ2:£¬·½ÏòˮƽÏò×ó
СÌâ3:

£¨1£©ÊÍ·Å˲¼ä£ºm_Bv_B=m_Cv_C       ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©
E_P =     ¡­¡­¡­¡­¡­£¨1·Ö£©
½âµÃ£º ¡­¡­¡­¡­¡­£¨1·Ö£©
ÎïÌåB¾­Ê±¼ät₁=ÏÈÓëľ²ÛAÏàײ    ¡­¡­¡­¡­¡­£¨1·Ö£©
ÓУºm_Bv_B =£¨m_A+m_B£©v_1¹²
½âµÃ£ºv_1¹²=          ¡­¡­¡­¡­¡­£¨2·Ö£©
£¨2£©Ä¾²ÛAÓëBÇòÏàײºó£¬Ò»ÆðÏò×óÔȼõËÙÔ˶¯£¬¼ÓËÙ¶È
     ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©
ľ²ÛAºÍÇòBÏàײºóËٶȼõΪ0µÄʱ¼ä¡­¡­¡­¡­¡­£¨1·Ö£©
ÔÚ£¨t₁+t₂£©Õâ¶Îʱ¼äÄÚ£¬ÎïÌåCºÍ²ÛÒƶ¯µÄ¾àÀëÖ®ºÍΪ£º
£¼LËùÒÔÔÚC ÓëAÏàײǰAÒÑÍ£Ö¹Ô˶¯£¨1·Ö£©
ÔÙ¾­¹ýÒ»¶Îʱ¼ä£¬ÇòCºÍľ²ÛÏàײ£¬ÓУºm_Cv_C=£¨m_A+m_B+m_C£©v_2¹²
½âµÃv_2¹²=£¬·½ÏòˮƽÏò×ó.            ¡­¡­¡­¡­¡­£¨2·Ö£©
£¨3£©µÚÒ»´ÎÏàײºóAÓëBµÄ×ܶ¯ÄÜÈ«¶¼×ª»¯ÎªÎªÄ¦²ÁÈÈ   ¡­¡­¡­¡­¡­¡­¡­¡­£¨2·Ö£©
µÚ¶þ´ÎÏàײºóϵͳµÄ×ܶ¯ÄÜÈ«¶¼×ª»¯ÎªÎªÄ¦²ÁÈÈ
   ¡­¡­¡­¡­¡­£¨2·Ö£©
Õû¸ö¹ý³ÌÖÐ×ÀÃæºÍľ²ÛÒòĦ²Á¶ø²úÉúµÄÈÈÁ¿Îª
              ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨1·Ö£©