ÌâÄ¿ÄÚÈÝ
£¨2008?³çÎÄÇøһģ£©ÈçͼËùʾ£¬ÔÚˮƽµØÃæÉÏ·½¸½½üÓÐÒ»·¶Î§×ã¹»´óµÄ»¥ÏàÕý½»µÄÔÈÇ¿µç³¡ºÍÔÈÇ¿´Å³¡ÇøÓò£®´Å³¡µÄ´Å¸ÐӦǿ¶ÈΪB£¬·½Ïòˮƽ²¢´¹Ö±Ö½ÃæÏòÀһÖÊÁ¿Îªm¡¢´øµçºÉÁ¿ÎªqµÄ´øÕýµç΢Á£ÔÚ´ËÇøÓòÄÚÑØÊúֱƽÃ棨´¹Ö±Óڴų¡·½ÏòµÄƽÃ棩×öËٶȴóСΪvµÄÔÈËÙÔ²ÖÜÔ˶¯£¬ÖØÁ¦¼ÓËÙ¶ÈΪg£®
£¨1£©Çó´ËÇøÓòÄڵ糡ǿ¶ÈµÄ´óСºÍ·½Ïò
£¨2£©Èôijʱ¿Ì΢Á£ÔÚ³¡ÖÐÔ˶¯µ½Pµãʱ£¬ËÙ¶ÈÓëˮƽ·½ÏòµÄ¼Ð½ÇΪ60¡ã£¬ÇÒÒÑÖªPµãÓëˮƽµØÃæ¼äµÄ¾àÀëµÈÓÚÆä×öÔ²ÖÜÔ˶¯µÄ°ë¾¶£®Çó¸Ã΢Á£Ô˶¯µ½×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀ룮
£¨3£©µ±´øµç΢Á£Ô˶¯ÖÁ×î¸ßµãʱ£¬½«µç³¡Ç¿¶ÈµÄ´óС±äΪÔÀ´µÄ
£¨²»¼Æµç³¡±ä»¯¶ÔԴų¡µÄÓ°Ï죩£¬ÇÒ´øµç΢Á£ÄÜÂäÖÁµØÃ棬Çó´øµç΢Á£ÂäÖÁµØÃæʱµÄËٶȴóС£®
£¨1£©Çó´ËÇøÓòÄڵ糡ǿ¶ÈµÄ´óСºÍ·½Ïò
£¨2£©Èôijʱ¿Ì΢Á£ÔÚ³¡ÖÐÔ˶¯µ½Pµãʱ£¬ËÙ¶ÈÓëˮƽ·½ÏòµÄ¼Ð½ÇΪ60¡ã£¬ÇÒÒÑÖªPµãÓëˮƽµØÃæ¼äµÄ¾àÀëµÈÓÚÆä×öÔ²ÖÜÔ˶¯µÄ°ë¾¶£®Çó¸Ã΢Á£Ô˶¯µ½×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀ룮
£¨3£©µ±´øµç΢Á£Ô˶¯ÖÁ×î¸ßµãʱ£¬½«µç³¡Ç¿¶ÈµÄ´óС±äΪÔÀ´µÄ
1 | 2 |
·ÖÎö£º£¨1£©ÓÉÌ⣬´øµç΢Á£ÔÚÊúֱƽÃæÄÚ×öÔÈËÙÔ²ÖÜÔ˶¯£¬´øµç΢Á£ËùÊܵĵ糡Á¦ºÍÖØÁ¦±Ø¶¨´óСÏàµÈ¡¢·½ÏòÏà·´£®
£¨2£©´øµç΢Á£ÓÉÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨Âɾȳö¹ì¼£°ë¾¶£¬Óɼ¸ºÎ¹ØϵÇó³ö¸Ã΢Á£Ô˶¯µ½×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀ룮
£¨3£©´øµç΢Á£´Ó×î¸ßµãÂäÖÁµØÃæ¹ý³ÌÖУ¬¸ù¾Ý¶¯Äܶ¨ÀíÇó½â´øµç΢Á£ÂäÖÁµØÃæʱµÄËٶȴóС£®
£¨2£©´øµç΢Á£ÓÉÂåÂ××ÈÁ¦ÌṩÏòÐÄÁ¦£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨Âɾȳö¹ì¼£°ë¾¶£¬Óɼ¸ºÎ¹ØϵÇó³ö¸Ã΢Á£Ô˶¯µ½×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀ룮
£¨3£©´øµç΢Á£´Ó×î¸ßµãÂäÖÁµØÃæ¹ý³ÌÖУ¬¸ù¾Ý¶¯Äܶ¨ÀíÇó½â´øµç΢Á£ÂäÖÁµØÃæʱµÄËٶȴóС£®
½â´ð£º½â£º£¨1£©ÓÉÓÚ´øµç΢Á£¿ÉÒÔÔڵ糡¡¢´Å³¡ºÍÖØÁ¦³¡¹²´æµÄÇøÓòÄÚÑØÊúֱƽÃæ×öÔÈËÙÔ²ÖÜÔ˶¯£¬±íÃ÷´øµç΢Á£ËùÊܵĵ糡Á¦ºÍÖØÁ¦´óСÏàµÈ¡¢·½ÏòÏà·´£®
Òò´Ëµç³¡Ç¿¶ÈµÄ·½ÏòÊúÖ±ÏòÉÏ£®
Éèµç³¡Ç¿¶ÈΪE£¬ÔòÓÐmg=qE£¬¼´E=
£®
£¨2£©Éè´øµç΢Á£×öÔÈËÙÔ²ÖÜÔ˶¯µÄ¹ìµÀ°ë¾¶ÎªR£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɺÍÂåÂØ×ÈÁ¦¹«Ê½ÓÐqvB=m
£¬½âµÃ£¬R=
ÒÀÌâÒâ¿É»³ö´øµç΢Á£×öÔÈËÙÔ²ÖÜÔ˶¯µÄ¹ì¼££¬ÓÉÈçͼËùʾµÄ¼¸ºÎ¹Øϵ¿ÉÖª£¬¸Ã΢Á£Ô˶¯ÖÁ×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀëΪ£ºhm=
R=
£¨3£©½«µç³¡Ç¿¶ÈµÄ´óС±äΪÔÀ´µÄ
£¬Ôòµç³¡Á¦±äΪÔÀ´µÄ
£¬¼´Fµç=
mg£®
´øµç΢Á£Ô˶¯¹ý³ÌÖУ¬ÂåÂØ×ÈÁ¦²»×ö¹¦£¬ËùÒÔÔÚËü´Ó×î¸ßµãÔ˶¯ÖÁµØÃæµÄ¹ý³ÌÖУ¬Ö»ÓÐÖØÁ¦ºÍµç³¡Á¦×ö¹¦£®Éè´øµç΢Á£ÂäµØʱµÄËٶȴóСΪvt£¬¸ù¾Ý¶¯Äܶ¨ÀíÓÐ
mghm-Fµçhm=
mvt2-
mv2
½âµÃ£ºvt=
´ð£º£¨1£©µç³¡Ç¿¶ÈµÄ·½ÏòÊúÖ±ÏòÉÏ£¬´óСΪE=
£®
£¨2£©¸Ã΢Á£Ô˶¯µ½×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀëÊÇ
£®
£¨3£©´øµç΢Á£ÂäÖÁµØÃæʱµÄËٶȴóСÊÇ
£®
Òò´Ëµç³¡Ç¿¶ÈµÄ·½ÏòÊúÖ±ÏòÉÏ£®
Éèµç³¡Ç¿¶ÈΪE£¬ÔòÓÐmg=qE£¬¼´E=
mg |
q |
£¨2£©Éè´øµç΢Á£×öÔÈËÙÔ²ÖÜÔ˶¯µÄ¹ìµÀ°ë¾¶ÎªR£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂɺÍÂåÂØ×ÈÁ¦¹«Ê½ÓÐqvB=m
v2 |
R |
mv |
qB |
ÒÀÌâÒâ¿É»³ö´øµç΢Á£×öÔÈËÙÔ²ÖÜÔ˶¯µÄ¹ì¼££¬ÓÉÈçͼËùʾµÄ¼¸ºÎ¹Øϵ¿ÉÖª£¬¸Ã΢Á£Ô˶¯ÖÁ×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀëΪ£ºhm=
5 |
2 |
5mv |
2qB |
£¨3£©½«µç³¡Ç¿¶ÈµÄ´óС±äΪÔÀ´µÄ
1 |
2 |
1 |
2 |
1 |
2 |
´øµç΢Á£Ô˶¯¹ý³ÌÖУ¬ÂåÂØ×ÈÁ¦²»×ö¹¦£¬ËùÒÔÔÚËü´Ó×î¸ßµãÔ˶¯ÖÁµØÃæµÄ¹ý³ÌÖУ¬Ö»ÓÐÖØÁ¦ºÍµç³¡Á¦×ö¹¦£®Éè´øµç΢Á£ÂäµØʱµÄËٶȴóСΪvt£¬¸ù¾Ý¶¯Äܶ¨ÀíÓÐ
mghm-Fµçhm=
1 |
2 |
1 |
2 |
½âµÃ£ºvt=
v2+
|
´ð£º£¨1£©µç³¡Ç¿¶ÈµÄ·½ÏòÊúÖ±ÏòÉÏ£¬´óСΪE=
mg |
q |
£¨2£©¸Ã΢Á£Ô˶¯µ½×î¸ßµãʱÓëˮƽµØÃæ¼äµÄ¾àÀëÊÇ
5mv |
2qB |
£¨3£©´øµç΢Á£ÂäÖÁµØÃæʱµÄËٶȴóСÊÇ
v2+
|
µãÆÀ£º±¾ÌâÖдøµç΢Á£ÔÚ¸´ºÏ³¡ÖÐÔ˶¯£¬¸ù¾Ý΢Á£µÄÔ˶¯×´Ì¬·ÖÎö΢Á£µÄÊÜÁ¦Çé¿öÊǹؼü£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿