ÌâÄ¿ÄÚÈÝ

ÈçͼËùʾ£¬³¤ÎªLµÄľ°åAÓұ߹̶¨×ÅÒ»¸öµ²°å£¬°üÀ¨µ²°åÔÚÄÚµÄ×ÜÖÊÁ¿Îª1.5M£¬¾²Ö¹Ôڹ⻬µÄˮƽµØÃæÉÏ¡£ÓÐÒ»ÖÊÁ¿ÎªMµÄСľ¿éB£¬´Óľ°åAµÄ×ó¶Ë¿ªÊ¼ÒÔ³õËÙ¶Èv0ÔÚ

ľ°åAÉÏ»¬¶¯¡£Ð¡Ä¾¿éBÓëľ°åA¼äĦ²ÁÒòÊýΪ¦Ì£¬Ð¡Ä¾¿éB»¬µ½Ä¾°åAµÄÓÒ¶ËÓëµ²°å·¢ÉúÅöײ¡£ÒÑÖªÅöײ¹ý³Ìʱ¼ä¼«¶Ì£¬ÇÒÅöºóľ¿éBÇ¡ºÃ»¬µ½Ä¾°åAµÄ×ó¶Ë¾ÍÍ£Ö¹»¬¶¯¡£

£¨1£©Èô¦ÌL=3v02/160g£¬ÔÚСľ¿éBÓëµ²°åÅöײºóµÄÔ˶¯¹ý³ÌÖУ¬Ä¦²ÁÁ¦¶Ôľ°åA×öÕý¹¦»¹ÊǸº¹¦£¿×öÁ˶àÉÙ£¿

£¨2£©ÌÖÂÛľ°åAºÍСľ¿éBÔÚÕû¸ö¹ý³ÌÖУ¬ÊÇ·ñÓпÉÄÜÔÚijһ¶Îʱ¼äÄÚÏà¶ÔµØÃæÔ˶¯·½ÏòÊÇÏò×óµÄ¡£Èç¹û²»¿ÉÄÜ£¬ËµÃ÷ÀíÓÉ£»Èç¹û¿ÉÄÜ£¬Çó³öÖÁÉÙ¿ÉÄÜÏò×󻬶¯¡¢ÓÖÄܱ£Ö¤Ä¾°åAºÍСľ¿éB¸ÕºÃ²»ÍÑÀëµÄÌõ¼þ¡£

£¨1£©Ä¦²ÁÁ¦¶Ôľ°å×ö¸º¹¦£¬´óСΪ£¨27/400£©M v02

£¨2£©BÏò×ó»¬ÓÖ²»ÍÑÀëAµÄÌõ¼þÊÇ2v02/15g£¼¦ÌL¡Ü3v02/20g


½âÎö:

£¨1£©ÉèBÓëAÅöײºóA¡¢BµÄËÙ¶È·Ö±ðΪvA¡¢vB £¬×îÖÕA¡¢BµÄ¹²Í¬ËÙ¶ÈΪv£¬ÔòÓɶ¯Á¿Êغ㡢ÄÜÁ¿ÊغãÓÐmBv0=mAvA+mBvB£¬mBv0=£¨mA+mB£©v

¦ÌmBgL=£¨1/2£©mAvA2+£¨1/2£©mBvB2-£¨1/2£©£¨mA+mB£©v2

ÓÖ¦ÌL=3v02/160g

ÒÔÉϸ÷ʽÁªÁнâµÃv=£¨2/5£©v0£¬vA=£¨1/2£©v0£¬vB=£¨1/4£©v0

»òv=£¨2/5£©v0£¬vA=£¨3/10£©v0£¬vB=£¨11/20£©v0

·ÖÎöÉÏÊöÁ½×é½á¹û£¬ÓÉÓÚÁ½ÎïÅöײºó¾ùÓëv0ͬÏò£¬¶øÆäÖеڶþ×é½á¹ûvA=£¨3/10£©v0£¼vB=£¨11/20£©v0£¬¸ÃËٶȹØÏµÓëʵ¼Ê²»·û£¬ÉáÈ¥

Òò´Ë£¬Óɶ¯Äܶ¨Àí¿ÉµÃĦ²ÁÁ¦×ö¹¦

     Wf =£¨1/2£©£¨1.5M£©v2-£¨1/2£©£¨1.5M£©vA2=-£¨27/400£©M v02

     ¼´Ä¦²ÁÁ¦¶Ôľ°å×ö¸º¹¦£¬´óСΪ£¨27/400£©M v02

£¨2£©Õû¸ö¹ý³Ì¶¯Á¿Êغ㣬A²»¿ÉÄÜÏò×óÔ˶¯£¬ÅöºóB¿ÉÄÜ¡£

ҪʹBÏò×óÔ˶¯£¬Óɶ¯Á¿Êغ㡢ÄÜÁ¿ÊغãÓÐ

mBv0=mAvA+mBvB£¬mBv0=£¨mA+mB£©v

¦ÌmBgL=£¨1/2£©mAvA2+£¨1/2£©mBvB2-£¨1/2£©£¨mA+mB£©v2  vB£¼0

ÒÔÉϸ÷ʽÁªÁнâµÃ¦ÌL£¾2v02/15g

Òª±£Ö¤AºÍB²»ÍÑÀ룬Óɶ¯Á¿ÊغãºÍÄÜÁ¿ÊغãÓÐ

mBv0=£¨mA+mB£©v

2¦ÌmBgL¡Ý£¨1/2£©mBv02-£¨1/2£©£¨mA+mB£©v2

½âµÃ¦ÌL¡Ü3v02/20g

¹ÊBÏò×ó»¬ÓÖ²»ÍÑÀëAµÄÌõ¼þÊÇ2v02/15g£¼¦ÌL¡Ü3v02/20g

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø