ÌâÄ¿ÄÚÈÝ
´ÓÈçͼËùʾˮƽµØÃæÉϵÄAµãÒÔÒ»¶¨µÄ³õËٶȺÍÑö½Ç·¢ÉäÅÚµ¯£¬ÔÚÕý³£Çé¿öÏ£¬ÅÚµ¯¾¹ý×î¸ßµãC£¨½ö¾ßÓÐˮƽËٶȣ©µ½´ïˮƽµØÃæÉϵÄBµãʱ±¬Õ¨£®ÅÚµ¯ÔÚ¿ÕÖеÄÔ˶¯¹ì¼£ÊǶԳÆÓÚoyÖáµÄÅ×ÎïÏߣ®A¡¢B¡¢CÈýµãµÄ×ø±êÖáÒÑÔÚͼÖбêÃ÷£¬ÔÚij´Î·¢ÉäÖУ¬ÅÚµ¯µ½´ïCºó¾Í±¬ÁѳÉa¡¢bÁ½¿é£¬ÆäÖе¯Æ¬aÇ¡ºÃÑØÔ·¾¶·µ»Øµ½Aµã£¬ÒÑÖª£¬ÅÚµ¯µ½´ïCµãʱµÄ¶¯ÄÜΪE0£¬Õ¨ÁѺóµ¯Æ¬aµÄÖÊÁ¿ÊÇÅÚµ¯ÖÊÁ¿µÄ
£¬¿ÕÆø×èÁ¦¿ÉºöÂÔ²»¼Æ£¬ÊÔÇó£º
£¨1£©µ¯Æ¬bµÄÂäµØµãDµÄºá×ø±êxD£»
£¨2£©ÅÚµ¯±¬Õ¨Ê±£¬ÓÉ»¯Ñ§ÄÜת»¯³ÉµÄ»úеÄÜ¡÷E£®
2 | 3 |
£¨1£©µ¯Æ¬bµÄÂäµØµãDµÄºá×ø±êxD£»
£¨2£©ÅÚµ¯±¬Õ¨Ê±£¬ÓÉ»¯Ñ§ÄÜת»¯³ÉµÄ»úеÄÜ¡÷E£®
·ÖÎö£º£¨1£©¸ù¾ÝE0=
m
ÇóµÃÅÚµ¯µ½´ïCºó±¬ÁÑǰ˲¼äµÄËٶȴóС£®ÅÚµ¯±¬Õ¨¹ý³ÌÄÚÁ¦Ô¶´óÓÚÍâÁ¦£¬Âú×㶯Á¿Êغ㣬¸ù¾Ý¶¯Á¿Êغ㶨ÂÉÇó³öÅÚµ¯±¬Õ¨ºó˲¼äµ¯Æ¬bµÄËٶȣ®Õ¨ºóa¡¢bµ¯Æ¬¾ù×öƽÅ×£¬ÇҸ߶ÈÏàͬ£¬ÂäµØËùÓÃʱ¼äÏàͬ£¬¸ù¾ÝˮƽλÒÆÓë³õËٶȳÉÕý±È£¬¼´¿ÉÇóµÃµ¯Æ¬bµÄÂäµØµãDµÄºá×ø±êxD£»
£¨2£©±¬Õ¨Ç°ºó×ÜÄÜÁ¿Êغ㣬ÔËÓÃÄÜÁ¿Êغ㶨ÂÉÇó½â£®
1 |
2 |
v | 2 0 |
£¨2£©±¬Õ¨Ç°ºó×ÜÄÜÁ¿Êغ㣬ÔËÓÃÄÜÁ¿Êغ㶨ÂÉÇó½â£®
½â´ð£º½â£º
£¨1£©ÉèÅÚµ¯ÖÊÁ¿Îªm£¬ÔòÒÀÌâÒâÓÐ E0=
m
£»
ÅÚµ¯±¬Õ¨¹ý³ÌÄÚÁ¦Ô¶´óÓÚÍâÁ¦£¬Âú×㶯Á¿Êغ㣬ÔòÒÀÌâÒâÓУº
mv0=-
m
+
mv
½âµÃ£ºv=5
£»
Õ¨ºóa¡¢bµ¯Æ¬¾ù×öƽÅ×£¬ÇҸ߶ÈÏàͬ£¬ÂäµØËùÓÃʱ¼äÏàͬ£¬ÔòÓУº
=
=
½âµÃ£ºxD=5L£®
£¨2£©±¬Õ¨Ç°ºó×ÜÄÜÁ¿Êغ㣬ÔòÓÐ
m
+¡÷E=
¡Á
m
+
¡Á
m
½âµÃ£º¡÷E=4m
=8E0£»
´ð£º
£¨1£©µ¯Æ¬bµÄÂäµØµãDµÄºá×ø±êxDΪ5L£®
£¨2£©ÅÚµ¯±¬Õ¨Ê±£¬ÓÉ»¯Ñ§ÄÜת»¯³ÉµÄ»úеÄÜ¡÷EΪ8E0£®
£¨1£©ÉèÅÚµ¯ÖÊÁ¿Îªm£¬ÔòÒÀÌâÒâÓÐ E0=
1 |
2 |
v | 2 0 |
ÅÚµ¯±¬Õ¨¹ý³ÌÄÚÁ¦Ô¶´óÓÚÍâÁ¦£¬Âú×㶯Á¿Êغ㣬ÔòÒÀÌâÒâÓУº
mv0=-
2 |
3 |
v | 0 |
1 |
3 |
½âµÃ£ºv=5
v | 0 |
Õ¨ºóa¡¢bµ¯Æ¬¾ù×öƽÅ×£¬ÇҸ߶ÈÏàͬ£¬ÂäµØËùÓÃʱ¼äÏàͬ£¬ÔòÓУº
xD |
xA |
vt |
v0t |
v |
v0 |
½âµÃ£ºxD=5L£®
£¨2£©±¬Õ¨Ç°ºó×ÜÄÜÁ¿Êغ㣬ÔòÓÐ
1 |
2 |
v | 2 0 |
1 |
2 |
2 |
3 |
v | 2 0 |
1 |
2 |
1 |
3 |
v | 2 0 |
½âµÃ£º¡÷E=4m
v | 2 0 |
´ð£º
£¨1£©µ¯Æ¬bµÄÂäµØµãDµÄºá×ø±êxDΪ5L£®
£¨2£©ÅÚµ¯±¬Õ¨Ê±£¬ÓÉ»¯Ñ§ÄÜת»¯³ÉµÄ»úеÄÜ¡÷EΪ8E0£®
µãÆÀ£ºÓ¦Óö¯Á¿Êغ㶨ÂÉʱҪÇå³þÑо¿µÄ¶ÔÏóºÍÊغãÌõ¼þ£®Í¬Ò»¸öÎÊÌâ¿ÉÄÜ»áÑ¡Ôñ²»Í¬µÄϵͳ×÷ΪÑо¿¶ÔÏó£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿