ÌâÄ¿ÄÚÈÝ

¾«Ó¢¼Ò½ÌÍøÈçͼËùʾ£¬MNÊÇÒ»¹Ì¶¨ÔÚˮƽµØÃæÉÏ×ã¹»³¤µÄ¾øԵƽ°å£¨×ó²àÓе²°å£©£¬Õû¸ö¿Õ¼äÓÐƽÐÐÓÚƽ°åÏòÓÒ¡¢³¡Ç¿ÎªE=2N/CµÄÔÈÇ¿µç³¡£¬ÔÚ°åÉÏCµãµÄ×ó²àÓÐÒ»¸ö´¹Ö±ÓÚÖ½ÃæÏòÍâ¡¢´Å¸ÐӦǿ¶ÈΪB=1TµÄÔÈÇ¿´Å³¡£¬Ò»¸öÖÊÁ¿Îªm=4¡Á10-3kg¡¢´ø¸ºµçµÄСÎï¿é£¬´øµçÁ¿q=10-2C£¬´ÓCµãÓɾ²Ö¹¿ªÊ¼Ïò×óÏÈ×ö¼ÓËÙÔ˶¯ÔÙ×öÔÈËÙÔ˶¯£®µ±ÎïÌåÅöµ½×ó¶Ëµ²°åºó±»µ¯»Ø£¬ÈôÔÚÅöײ˲¼ä½«µç³¡¸ÄΪÊúÖ±ÏòÏ£¬´óС²»±ä£®Ð¡Îï¿é·µ»ØʱÔڴų¡ÖÐÇ¡×öÔÈËÙÔ˶¯£¬ÒÑ֪ƽ°åMC²¿·ÖµÄ³¤¶ÈΪL=5m£¬Îï¿éÓëƽ°å¼äµÄ¶¯Ä¦²ÁÒòÊýΪ¦Ì=0.2£¬Çó£º
£¨1£©Ð¡Îï¿éÏò×óÔ˶¯¹ý³ÌÖп˷þĦ²ÁÁ¦×öµÄ¹¦Wf£»
£¨2£©Ð¡Îï¿éÓë×ó¶Ëµ²°åÅöײ¹ý³ÌËðʧµÄ»úеÄÜ¡÷E£»
£¨3£©Ð¡Îï¿é´ÓÓë ×óµ²°åÅöºóµ½×îÖÕ¾²Ö¹ËùÓÃʱ¼ät£»
£¨4£©Õû¸ö¹ý³ÌÖÐÓÉÓÚĦ²Á²úÉúµÄÈÈÁ¿Q£®
·ÖÎö£º£¨1£©ÉèСÎï¿éÏò×óÔÈËÙÔ˶¯Ê±µÄËٶȴóСΪv1£¬ÓÉ×óÊÖ¶¨Ôò¿ÉÅж¨ÂåÂ××ÈÁ¦µÄ·½ÏòÏòÏ£¬ÓÉƽºâÌõ¼þºÍ¶¯Äܶ¨Âɼ´¿ÉÇóµÃ¿Ë·þĦ²ÁÁ¦×öµÄ¹¦£»
£¨2£©Ð¡Îï¿éÏòÓÒÔ˶¯Ê±ÂåÂ××ÈÁ¦µÄ·½ÏòÏòÉÏ£¬Ð¡Îï¿é·µ»ØʱÔڴų¡ÖÐÇ¡×öÔÈËÙÔ˶¯£¬ÔòÂåÂ××ÈÁ¦µÈÓÚÖØÁ¦Óëµç³¡Á¦µÄºÍ£»Ð¡Îï¿éÓë×ó¶Ëµ²°åÅöײ¹ý³ÌËðʧµÄ»úеÄÜ¡÷EΪǰºó¶¯ÄܵIJ
£¨3£©Ð¡Îï¿éÀ뿪´Å³¡ºó£¬Ä¦²ÁÁ¦×ö¹¦×îºóÍ£ÏÂÁË£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨Âɼ´¿ÉÇó³ö½á¹û£»
£¨4£©×ö¹¦¹ý³ÌÖмõÉٵĵçÊÆÄÜת»¯ÎªÅöײËðʧµÄÄÜÁ¿ºÍĦ²ÁÁ¦²úÉúµÄÄÚÄÜ£®
½â´ð£º½â£º£¨1£©ÉèСÎï¿éÏò×óÔÈËÙÔ˶¯Ê±µÄËٶȴóСΪv1£¬ÓÉ×óÊÖ¶¨Ôò¿ÉÅж¨ÂåÂ××ÈÁ¦µÄ·½ÏòÏòÏ£¬ÓÉƽºâÌõ¼þÓÐqE-¦Ì£¨mg+qv1B£©=0¡­¢Ù
ÉèСÎï¿éÔÚÏò×óÔ˶¯¹ý³ÌÖп˷þĦ²ÁÁ¦×öµÄ¹¦ÎªW£¬Óɶ¯Äܶ¨ÀíÓÐqEL-W=
1
2
m
v
2
1
-0
¡­¢Ú
ÓÉ¢Ù¢Úʽ½âµÃ W=qEL-
m(qE-¦Ìmg)2
2¦Ì2q2B2
=0.028
J¡­¢Û
£¨2£©ÉèСÎï¿é·µ»ØʱÔڴų¡ÖÐÔÈËÙÔ˶¯µÄËٶȴóСΪv2£¬ÓëÓҶ˵²°åÅöײ¹ý³ÌËðʧ»ú¹¹ÄÜΪ¡÷E£¬ÔòÓÐf=Bqv2¡­¢Ü£¬f=mg-qE¡­¢Ý
ÓɢۢܢÝʽ½âµÃ  ¡÷E=
mq2E2(1-¦Ì2)+2¦Ìm2gqE(¦Ì-1)
2¦Ì2B2q2
=0.064J
¡­¢Þ
£¨3£©Ð¡Îï¿éÓÉMµ½CÔÈËÙÔ˶¯£¬Ê±¼äΪ t1=
L
v2
=
BqL
mg-qE
=2.5s
¡­¢ß
СÎï¿éÓÉCµ½¾²Ö¹ÔȼõËÙÔ˶¯£¬¦Ì£¨mg-qE£©=ma´úÈëÊýµÃa=1m/s2¡­¢à
ʱ¼äΪ t2=
v2
a
=
mv2
¦Ì(mg-qE)
=2s
¡­¢á
×Üʱ¼äΪ t=t1+t2=4.5s     
£¨4£©¶ÔÈ«¹ý³Ì£¬ÓÉÄÜÁ¿Êغ㶨ÂÉÓР  Q=qEL-¡÷E¡­¢â
ÓÉ¢Þ¢âʽ½âµÃ   Q=qEL-¡÷E=0.036J
´ð£º£¨1£©Ð¡Îï¿éÏò×óÔ˶¯¹ý³ÌÖп˷þĦ²ÁÁ¦×öµÄ¹¦Îª0.023J£»
£¨2£©Ð¡Îï¿éÓë×ó¶Ëµ²°åÅöײ¹ý³ÌËðʧµÄ»úеÄÜ¡÷EΪ0.064J£»
£¨3£©Ð¡Îï¿é´ÓÓë ×óµ²°åÅöºóµ½×îÖÕ¾²Ö¹ËùÓÃʱ¼äΪ4.5s£»
£¨4£©Õû¸ö¹ý³ÌÖÐÓÉÓÚĦ²Á²úÉúµÄÈÈÁ¿Îª0.036J£®
µãÆÀ£º±¾Ìâ×ۺϵ糡¼°´Å³¡µÄ֪ʶ£¬Òª×¢Òâµç³¡Á¦×ö¹¦È¡¾öÓÚµçÊƲî¶øÂåÂØ×ÈÁ¦²»×ö¹¦£¬¹ÊÓ¦Óù¦ÄܹØϵ½â¾öÒ»°ãµÄÔ˶¯½ÏΪ¼òµ¥£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

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

¾«Ó¢¼Ò½ÌÍø