ÌâÄ¿ÄÚÈÝ
»·ÐͶÔײ»úÊÇÑо¿¸ßÄÜÁ£×ÓµÄÖØҪװÖã¬ÆäºËÐIJ¿¼þÊÇÒ»¸ö¸ßÕæ¿ÕµÄÔ²»·×´µÄ¿ÕÇ»£®Èô´øµçÁ£×Ó³õËÙ¿ÉÊÓΪÁ㣬¾µçѹΪUµÄµç³¡¼ÓËÙºó£¬ÑØÔ²»·ÇÐÏß·½Ïò×¢Èë¶Ôײ»úµÄ»·×´¿ÕÇ»ÄÚ£¬¿ÕÇ»ÄÚ´æÔÚ×ÅÓëÔ²»·Æ½Ãæ´¹Ö±µÄÔÈÇ¿´Å³¡£¬´Å¸ÐӦǿ¶È´óСΪB£®´øµçÁ£×Ó½«±»ÏÞÖÆÔÚÔ²»·×´¿ÕÇ»ÄÚÔ˶¯£®ÒªÎ¬³Ö´øµçÁ£×ÓÔÚÔ²»·ÄÚ×ö°ë¾¶È·¶¨µÄÔ²ÖÜÔ˶¯£¬ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
·ÖÎö£º´øµçÁ£×ÓÔڵ糡Öб»¼ÓËٺ󣬽øÈëÔÈÇ¿´Å³¡ºó×öÔÈËÙÔ²ÖÜÔ˶¯£®ÓÉÌâÖª£¬´øµçÁ£×ÓÔ²ÖÜÔ˶¯µÄ°ë¾¶¶¼Ïàͬ£¬ÔòÓɰ뾶¹«Ê½ÓëÁ£×ÓÔڵ糡ÖмÓËÙ¹«Ê½£º
mv2=qU£¬Ñо¿Á£×ӵıȺɺʹŸÐӦǿ¶È¡¢ÖÜÆڵĹØϵ£®
1 |
2 |
½â´ð£º½â£º´øµçÁ£×ÓÔÚÔÈÇ¿´Å³¡ÖÐ×öÔÈËÙÔ²ÖÜÔ˶¯£¬ÓÉÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦¿ÉÖª£ºBqv=m
µÃR=
£¨1£©
¶øÁ£×ÓÔڵ糡Öб»¼ÓËÙ£¬ÔòÓУº
mv2=qU £¨2£©
½«£¨1£©£¨2£©Á½Ê½ÁªÁ¢¿ÉµÃ£ºR=
?
£¬´øµçÁ£×ÓÔËÐеÄÖÜÆÚT=
£®
A¡¢B¶ÔÓÚ¸ø¶¨µÄ¼ÓËÙµçѹ£¬ÓÉÓڰ뾶RÏàͬ£¬ÓÉÉÏʽµÃÖª£¬´øµçÁ£×ӵıȺÉ
Ô½´ó£¬´Å¸ÐӦǿ¶ÈBԽС£®¹ÊA´íÎó£¬BÕýÈ·£®
C¡¢D¶ÔÓÚ¸ø¶¨µÄ´øµçÁ£×Ó£¬±ÈºÉ
Ò»¶¨£¬´Å¸ÐӦǿ¶ÈBÒ»¶¨£¬ÔòÁ£×ÓÔ˶¯ÖÜÆÚÒ»¶¨£¬Óë¼ÓËÙµçѹÎ޹أ®¹ÊC´íÎó£¬DÕýÈ·£®
¹ÊÑ¡BD
v2 |
R |
mv |
qB |
¶øÁ£×ÓÔڵ糡Öб»¼ÓËÙ£¬ÔòÓУº
1 |
2 |
½«£¨1£©£¨2£©Á½Ê½ÁªÁ¢¿ÉµÃ£ºR=
| ||
B |
|
2¦Ðm |
qB |
A¡¢B¶ÔÓÚ¸ø¶¨µÄ¼ÓËÙµçѹ£¬ÓÉÓڰ뾶RÏàͬ£¬ÓÉÉÏʽµÃÖª£¬´øµçÁ£×ӵıȺÉ
q |
m |
C¡¢D¶ÔÓÚ¸ø¶¨µÄ´øµçÁ£×Ó£¬±ÈºÉ
q |
m |
¹ÊÑ¡BD
µãÆÀ£º±¾Ìâͨ¹ýÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦À´µ¼³ö°ë¾¶¹«Ê½ÓëÖÜÆÚ¹«Ê½£¬ÔÙÓö¯Äܶ¨ÀíµÃ³öÁ£×ÓÔڵ糡ÖеļÓËÙ¹«Ê½£¬´Ó¶ø¿ÉÍƵ¼³ö¼ÓËÙµçѹ¡¢´Å¸ÐӦǿ¶È¡¢Á£×ӵıȺɼ°°ë¾¶µÄ¹Øϵ£®×îÖÕÓÉ¿ØÖƱäÁ¿À´Ñо¿ÆäËü¸÷Á¿Ö®¼äµÄ¾ßÌå¹Øϵ£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
»·ÐͶÔײ»úÊÇÑо¿¸ßÄÜÁ£×ÓµÄÖØҪװÖã¬ÆäºËÐIJ¿¼þÊÇÒ»¸ö¸ßÕæ¿ÕµÄÔ²»·×´µÄ¿ÕÇ»£®Èô´øµçÁ£×Ó³õËÙ¿ÉÊÓΪÁ㣬¾µçѹΪUµÄµç³¡¼ÓËÙºó£¬ÑØÔ²»·ÇÐÏß·½Ïò×¢Èë¶Ôײ»úµÄ»·×´¿ÕÇ»ÄÚ£¬¿ÕÇ»ÄÚ´æÔÚ×ÅÓëÔ²»·Æ½Ãæ´¹Ö±µÄÔÈÇ¿´Å³¡£¬´Å¸ÐӦǿ¶È´óСΪB£®´øµçÁ£×Ó½«±»ÏÞÖÆÔÚÔ²»·×´¿ÕÇ»ÄÚÔ˶¯£®ÒªÎ¬³Ö´øµçÁ£×ÓÔÚÔ²»·ÄÚ×ö°ë¾¶È·¶¨µÄÔ²ÖÜÔ˶¯£¬ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢¶ÔÓÚ¸ø¶¨µÄ¼ÓËÙµçѹ£¬´øµçÁ£×ӵıȺÉq/mÔ½´ó£¬´Å¸ÐӦǿ¶ÈBÔ½´ó | B¡¢¶ÔÓÚ¸ø¶¨µÄ¼ÓËÙµçѹ£¬´øµçÁ£×ӵıȺÉq/mÔ½´ó£¬´Å¸ÐӦǿ¶ÈBԽС | C¡¢¶ÔÓÚ¸ø¶¨µÄ´øµçÁ£×Ó£¬¼ÓËÙµçѹUÔ½´ó£¬Á£×ÓÔ˶¯µÄÖÜÆÚԽС | D¡¢¶ÔÓÚ¸ø¶¨µÄ´øµçÁ£×Ó£¬²»¹Ü¼ÓËÙµçѹU¶à´ó£¬Á£×ÓÔ˶¯µÄÖÜÆÚ¶¼²»±ä |