Èçͼ1Ëùʾ£¬Õæ¿ÕÊÒÖе缫K·¢³öµÄµç×Ó£¨³õËÙ²»¼Æ£©¾­¹ýU0=1000VµÄ¼ÓËٵ糡ºó£¬ÓÉС¿×SÑØÁ½Ë®Æ½½ðÊô°åA¡¢B¼äµÄÖÐÐÄÏßÉäÈ룮A¡¢B°å³¤l=0.20m£¬Ïà¾àd=0.020m£¬¼ÓÔÚA¡¢BÁ½°å¼äµÄµçѹuËæʱ¼ät±ä»¯µÄu-tͼÏßÈçͼ2Ëùʾ£®ÉèA¡¢B¼äµÄµç³¡¿É¿´×÷ÊǾùÔȵģ¬ÇÒÁ½°åÍâÎ޵糡£®ÔÚÿ¸öµç×Óͨ¹ýµç³¡ÇøÓòµÄ¼«¶Ìʱ¼äÄÚ£¬µç³¡¿ÉÊÓ×÷ºã¶¨µÄ£®Á½°åÓÒ²à·ÅÒ»¼Ç¼ԲͲ£¬Í²ÔÚ×ó²à±ßÔµÓ뼫°åÓҶ˾àÀëb=0.15m£¬Í²ÈÆÆäÊúÖ±ÖáÔÈËÙת¶¯£¬ÖÜÆÚT=0.20s£¬Í²µÄÖܳ¤s=0.20m£¬Í²ÄܽÓÊÕµ½Í¨¹ýA¡¢B°åµÄÈ«²¿µç×Ó£®
£¨1£©ÒÔt=0ʱ£¨¼ûͼ2£¬´Ëʱu=0£©µç×Ó´òµ½Ô²Í²¼Ç¼ֽÉϵĵã×÷Ϊxy×ø±êϵµÄÔ­µã£¬²¢È¡yÖáÊúÖ±ÏòÉÏ£®ÊÔ¼ÆËãµç×Ó´òµ½¼Ç¼ֽÉϵÄ×î¸ßµãµÄy×ø±êºÍx×ø±ê£®£¨²»¼ÆÖØÁ¦×÷Óã©
£¨2£©ÔÚ¸ø³öµÄ×ø±êÖ½£¨Í¼3£©É϶¨Á¿µØ»­³öµç×Ó´òµ½¼Ç¼ֽÉϵĵãÐγɵÄͼÏߣ®
·ÖÎö£ºÁ£×ÓÔÚƫתµç³¡ÖÐ×öÀàƽÅ×Ô˶¯£¬³öƫתµç³¡ºó×öÔÈËÙÖ±ÏßÔ˶¯£¬½áºÏ¶¯Äܶ¨Àí¡¢Å£¶ÙµÚ¶þ¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½Çó³öÁ£×ÓÇ¡ºÃÌù׿«°å±ßÔµ³ö´Å³¡Ê±µÄƫתµçѹµÄ´óС£¬´Ó¶øÈ·¶¨³öÄĶÎʱ¼äÄÚ½øÈëµÄÁ£×ÓÄܹ»³öƫתµç³¡£¬½áºÏ¼¸ºÎ¹ØϵÇó³ö×î¸ßµãµÄλÖÃ×ø±ê£¬¸ù¾Ýµçѹ±ä»¯µÄÖÜÆÚÐÔÈ·¶¨xµÄ×ø±ê£¬´Ó¶ø»­³öµç×Ó´òµ½¼Ç¼ֽÉϵĵãÐγɵÄͼÏߣ®
½â´ð£º½â£º£¨1£©¼ÆËãµç×Ó´òµ½¼Ç¼ֽÉϵÄ×î¸ßµãµÄ×ø±êÉèv0Ϊµç×ÓÑØA¡¢B°åµÄÖÐÐÄÏßÉäÈë
µç³¡Ê±µÄ³õËٶȣ¬Ôò
1
2
mv02=eU0
                  ¢Ù
µç×ÓÔÚÖÐÐÄÏß·½ÏòµÄÔ˶¯ÎªÔÈËÙÔ˶¯£¬Éèµç×Ó´©¹ýA¡¢B°åµÄʱ¼äΪt0£¬Ôò
l=v0t0¢Ú

µç×ÓÔÚ´¹Ö±A¡¢B°å·½ÏòµÄÔ˶¯ÎªÔȼÓËÙÖ±ÏßÔ˶¯¶ÔÓÚÇ¡ÄÜ´©¹ýA¡¢B°åµÄµç×Ó£¬ÔÚËüͨ¹ýʱ¼ÓÔÚÁ½°å¼äµÄµçѹucÓ¦Âú×ã
1
2
d=
1
2
?
euc
md
t02
               ¢Û
ÁªÁ¢¢Ù¡¢¢Ú¡¢¢Ûʽ½âµÃ
uc=
2d2
l2
U0=20V

´Ëµç×Ó´ÓA¡¢B°åÉä³öʱÑØy·½ÏòµÄ·ÖËÙ¶ÈΪ   vy=
euc
md
t0
                 ¢Ü
´Ëºó£¬´Ëµç×Ó×÷ÔÈËÙÖ±ÏßÔ˶¯£¬Ëü´òÔڼǼֽÉϵĵã×î¸ß£¬Éè×Ý×ø±êΪy£¬ÓÉͼ£¨1£©¿ÉµÃ
y-
d
2
b
=
vy
v0
                  ¢Ý
ÓÉÒÔÉϸ÷ʽ½âµÃ  y=
bd
l
+
d
2
=
0.15¡Á0.02
0.2
+
0.02
2
m=0.025m=2.5cm
           ¢Þ
´ÓÌâ¸øµÄu-tͼÏß¿ÉÖª£¬¼ÓÓÚÁ½°åµçѹuµÄÖÜÆÚT0=0.10Ã룬uµÄ×î´óÖµum=100·ü£¬ÒòΪuC£¼um£¬ÔÚÒ»¸öÖÜÆÚT0ÄÚ£¬Ö»ÓпªÊ¼µÄÒ»¶Îʱ¼ä¼ä¸ô¡÷tÄÚÓеç×Óͨ¹ýA¡¢B°å
¡÷t=
uc
um
T0
                   ¢ß
ÒòΪµç×Ó´òÔڼǼֽÉϵÄ×î¸ßµã²»Ö¹Ò»¸ö£¬¸ù¾ÝÌâÖйØÓÚ×ø±êÔ­µãÓëÆðʼ¼Ç¼ʱ¿ÌµÄ¹æ¶¨£¬µÚÒ»¸ö×î¸ßµãµÄx×ø±êΪ
x1=
¡÷t
T
s=2cm
            ¢à
µÚ¶þ¸ö×î¸ßµãµÄx×ø±êΪ
x2=
¡÷t+T0
T
s=12cm
       ¢á
µÚÈý¸ö×î¸ßµãµÄx×ø±êΪ
x3=
¡÷t+2T0
T
s=22cm

ÓÉÓڼǼͲµÄÖܳ¤Îª20ÀåÃ×£¬ËùÒÔµÚÈý¸ö×î¸ßµãÒÑÓëµÚÒ»¸ö×î¸ßµãÖغϣ¬¼´µç×Ó´òµ½¼Ç¼ֽÉϵÄ×î¸ßµãÖ»ÓÐÁ½¸ö£¬ËüÃǵÄx×ø±ê·Ö±ðÓÉ¢àºÍ¢á±íʾ
£¨2£©µç×Ó´òµ½¼Ç¼ֽÉÏËùÐγɵÄͼÏߣ¬Èçͼ£¨2£©Ëùʾ£®

´ð£º£¨1£©µç×Ó´òµ½¼Ç¼ֽÉϵÄ×î¸ßµãµÄy×ø±êΪ2.5cm£¬x×ø±êΪ2cm»ò12cm£®
£¨2£©ÈçͼËùʾ£®
µãÆÀ£º½â¾ö±¾ÌâµÄ¹Ø¼üÀíÇåÁ£×ÓÔÚÕû¸ö¹ý³ÌÖеÄÔ˶¯¹æÂÉ£¬Çó³öÇ¡ºÃÀ뿪ƫתµç³¡Ê±µÄƫתµçѹ£®½áºÏ¶¯Äܶ¨Àí¡¢Å£¶ÙµÚ¶þ¶¨ÂɺÍÔ˶¯Ñ§¹«Ê½½øÐÐÇó½â£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£ºÔĶÁÀí½â

ʾ²¨Æ÷ÊÇÒ»ÖÖ³£ÓõĵçѧÒÇÆ÷£¬¿ÉÒÔÔÚÓ«¹âÆÁÉÏÏÔʾ³ö±»¼ì²âµÄµçѹËæʱ¼äµÄ±ä»¯Çé¿ö£®ËüµÄ¹¤×÷Ô­ÀíÈçͼ1Ëùʾ£¬Õæ¿ÕÊÒÖÐÒõ¼«KÒݳöµç×Ó£¨³õËٶȿɺöÂÔ²»¼Æ£©£¬¾­¹ýµçѹUl=910VµÄ¼ÓËٵ糡ºó£¬ÓÉС¿×SÑØÕý¶ÔÇÒÏ໥¿¿½üµÄˮƽ½ðÊô¼«°åA¡¢B ºÍÊúÖ±½ðÊô°åC¡¢D ¼äµÄÖÐÐÄÏßÒÀ´Îͨ¹ýÁ½¶ÔƽÐнðÊô°å¼ä£®ÇÒÒÑÖªA¡¢BºÍC¡¢DµÄ³¤¶È¾ùΪl=0.20m£¬A¡¢BºÍC¡¢DÁ½°å¼äµÄ¾àÀë¾ùΪd=0.020m£¬½ðÊô°åµÄÃæ»ý×ã¹»´ó£®ÔÚA¡¢BÁ½°å¼ä¼ÓÉÏÈçͼ2ËùʾµÄÕýÏÒ½»±äµçu2£¬µ±A°åµçÊƸßÓÚB°åµçÊÆʱ£¬µçѹ¼ÇΪÕýÖµ£»ÔÚC¡¢DÁ½°å¼ä¼ÓÉÏÈçͼ3ËùʾµÄ½»±äµçѹu3£¬µ±C°åµçÊƸßÓÚD°åµçÊÆʱ£¬µçѹ¼ÇΪÕýÖµ£®Á½¶Ô½ðÊô°å¼äµÄµç³¡¿ÉÊÓΪȫ²¿¼¯ÖÐÔÚÁ½°åÖ®¼ä£¬ÇÒ·Ö²¼¾ùÔÈ£®ÔÚC¡¢D Á½¼«°åÓÒ²àÓ뼫°åÓÒ¶ËÏà¾às=0.30m´¦ÓÐÒ»¸öÓëÁ½¶Ô½ðÊô°åÖÐÐÄÏß´¹Ö±µÄÓ«¹âÆÁ£¬ÖÐÐÄÏßÕýºÃ¾­¹ýÆÁµÄÖе㣮Èô²»¼ÆÁ½¶Ô½ðÊô°åÖ®¼äµÄ¾àÀ룬ÇÒÓ«¹âÆÁ×ã¹»´ó£¬²¢ÒÑÖªµç×ÓµÄÖÊm=0.91¡Á10-30kg£¬Ëù´øµçºÉÁ¿e=1.6x10-19C£¬²»¼Æµç×ÓÖ®¼äµÄÏ໥×÷ÓÃÁ¦£®
¾«Ó¢¼Ò½ÌÍø
£¨1£©ÒªÊ¹ËùÓеĵç×Ó¶¼ÄÜ´òÔÚÓ«¹âÆÁÉÏ£¬Á½¶Ôƫת½ðÊô°å¼äËù¼ÓµçѹµÄ×î´óÖµU20¡¢U30Ó¦Âú×ãʲôÌõ¼þ£¿
£¨2£©ÈôU20Âú×㣨1£©ÖеÄÌõ¼þ£¬ÒªÊ¹Ó«¹âÆÁÉÏÄÜÏÔʾ³öu2 µÄÈô¸É¸öÍêÕûÖÜÆÚÄڵIJ¨ÐΣ¬C¡¢D Á½°å¼äËù¼Ó½»±äµçѹu3 µÄÖÜÆÚÓ¦Âú×ãʲôÌõ¼þ£¿
£¨3£©ÈôÓ«¹âÆÁÉÏÏÔʾ³öÒ»¸öu2 ÍêÕûµÄ²¨ÐΣ¬¼ÆËãÕâ¸ö²¨ÐεķåÖµ¸ß¶ÈºÍ×î´ó³¤¶È£¬²¢ÔÚͼ4Öл­³öÕâ¸ö²¨ÐΣ®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

£¨20·Ö)Èçͼ1Ëùʾ£¬Õæ¿ÕÊÒÖе缫K·¢³öµÄµç×Ó£¨³õËÙ²»¼Æ£©¾­¹ýU0=1000VµÄ¼ÓËٵ糡ºó£¬ÓÉС¿×SÑØÁ½Ë®Æ½½ðÊô°åA¡¢B¼äµÄÖÐÐÄÏßÉäÈë¡£A¡¢B°å³¤l=0.k^s*5#u20m£¬Ïà¾àd=0.k^s*5#u020m£¬¼ÓÔÚA¡¢BÁ½°å¼äµÄµçѹuËæʱ¼ät±ä»¯µÄu-tͼÏßÈçͼ2Ëùʾ¡£ÉèA¡¢B¼äµÄµç³¡¿É¿´×÷ÊǾùÔȵģ¬ÇÒÁ½°åÍâÎ޵糡¡£ÔÚÿ¸öµç×Óͨ¹ýµç³¡ÇøÓòµÄ¼«¶Ìʱ¼äÄÚ£¬µç³¡¿ÉÊÓ×÷ºã¶¨µÄ¡£Á½°åÓÒ²à·ÅÒ»¼Ç¼ԲͲ£¬Í²ÔÚ×ó²à±ßÔµÓ뼫°åÓҶ˾àÀëb=0.k^s*5#u15m£¬Í²ÈÆÆäÊúÖ±ÖáÔÈËÙת¶¯£¬ÖÜÆÚT=0.k^s*5#u20s£¬Í²µÄÖܳ¤s=0.k^s*5#u20m£¬Í²ÄܽÓÊÕµ½Í¨¹ýA¡¢B°åµÄÈ«²¿µç×Ó¡£

£¨1£©ÒÔt=0ʱ£¨¼ûͼ2£¬´Ëʱu=0£©µç×Ó´òµ½Ô²Í²¼Ç¼ֽÉϵĵã×÷Ϊxy×ø±êϵµÄÔ­µã£¬²¢È¡yÖáÊúÖ±ÏòÉÏ¡£ÊÔ¼ÆËãµç×Ó´òµ½¼Ç¼ֽÉϵÄ×î¸ßµãµÄy×ø±êºÍx×ø±ê¡££¨²»¼ÆÖØÁ¦×÷Óã©

£¨2£©ÔÚ¸ø³öµÄ×ø±êÖ½£¨Í¼3£©É϶¨Á¿µØ»­³öµç×Ó´òµ½¼Ç¼ֽÉϵĵãÐγɵÄͼÏß¡£

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2010ÄêºÓÄÏÊ¡Ö£ÖÝÍâ¹úÓïѧУȫÕæÄ£Ä⣨¶þ£©£¨Àí¿Æ×ۺϣ©ÎïÀí²¿·Ö ÌâÐÍ£º¼ÆËãÌâ

£¨20·Ö)Èçͼ1Ëùʾ£¬Õæ¿ÕÊÒÖе缫K·¢³öµÄµç×Ó£¨³õËÙ²»¼Æ£©¾­¹ýU0=1000VµÄ¼ÓËٵ糡ºó£¬ÓÉС¿×SÑØÁ½Ë®Æ½½ðÊô°åA¡¢B¼äµÄÖÐÐÄÏßÉäÈë¡£A¡¢B°å³¤l=0.k^s*5#u20m£¬Ïà¾àd=0.k^s*5#u020m£¬¼ÓÔÚA¡¢BÁ½°å¼äµÄµçѹuËæʱ¼ät±ä»¯µÄu-tͼÏßÈçͼ2Ëùʾ¡£ÉèA¡¢B¼äµÄµç³¡¿É¿´×÷ÊǾùÔȵģ¬ÇÒÁ½°åÍâÎ޵糡¡£ÔÚÿ¸öµç×Óͨ¹ýµç³¡ÇøÓòµÄ¼«¶Ìʱ¼äÄÚ£¬µç³¡¿ÉÊÓ×÷ºã¶¨µÄ¡£Á½°åÓÒ²à·ÅÒ»¼Ç¼ԲͲ£¬Í²ÔÚ×ó²à±ßÔµÓ뼫°åÓҶ˾àÀëb=0.k^s*5#u15m£¬Í²ÈÆÆäÊúÖ±ÖáÔÈËÙת¶¯£¬ÖÜÆÚT=0.k^s*5#u20s£¬Í²µÄÖܳ¤s=0.k^s*5#u20m£¬Í²ÄܽÓÊÕµ½Í¨¹ýA¡¢B°åµÄÈ«²¿µç×Ó¡£
£¨1£©ÒÔt=0ʱ£¨¼ûͼ2£¬´Ëʱu=0£©µç×Ó´òµ½Ô²Í²¼Ç¼ֽÉϵĵã×÷Ϊxy×ø±êϵµÄÔ­µã£¬²¢È¡yÖáÊúÖ±ÏòÉÏ¡£ÊÔ¼ÆËãµç×Ó´òµ½¼Ç¼ֽÉϵÄ×î¸ßµãµÄy×ø±êºÍx×ø±ê¡££¨²»¼ÆÖØÁ¦×÷Óã©
£¨2£©ÔÚ¸ø³öµÄ×ø±êÖ½£¨Í¼3£©É϶¨Á¿µØ»­³öµç×Ó´òµ½¼Ç¼ֽÉϵĵãÐγɵÄͼÏß¡£

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2010ÄêºÓÄÏÊ¡È«ÕæÄ£Ä⣨¶þ£©£¨Àí¿Æ×ۺϣ©ÎïÀí²¿·Ö ÌâÐÍ£º¼ÆËãÌâ

£¨20·Ö)Èçͼ1Ëùʾ£¬Õæ¿ÕÊÒÖе缫K·¢³öµÄµç×Ó£¨³õËÙ²»¼Æ£©¾­¹ýU0=1000VµÄ¼ÓËٵ糡ºó£¬ÓÉС¿×SÑØÁ½Ë®Æ½½ðÊô°åA¡¢B¼äµÄÖÐÐÄÏßÉäÈë¡£A¡¢B°å³¤l=0.20m£¬Ïà¾àd=0.020m£¬¼ÓÔÚA¡¢BÁ½°å¼äµÄµçѹuËæʱ¼ät±ä»¯µÄu-tͼÏßÈçͼ2Ëùʾ¡£ÉèA¡¢B¼äµÄµç³¡¿É¿´×÷ÊǾùÔȵģ¬ÇÒÁ½°åÍâÎ޵糡¡£ÔÚÿ¸öµç×Óͨ¹ýµç³¡ÇøÓòµÄ¼«¶Ìʱ¼äÄÚ£¬µç³¡¿ÉÊÓ×÷ºã¶¨µÄ¡£Á½°åÓÒ²à·ÅÒ»¼Ç¼ԲͲ£¬Í²ÔÚ×ó²à±ßÔµÓ뼫°åÓҶ˾àÀëb=0.15m£¬Í²ÈÆÆäÊúÖ±ÖáÔÈËÙת¶¯£¬ÖÜÆÚT=0.20s£¬Í²µÄÖܳ¤s=0.20m£¬Í²ÄܽÓÊÕµ½Í¨¹ýA¡¢B°åµÄÈ«²¿µç×Ó¡£

£¨1£©ÒÔt=0ʱ£¨¼ûͼ2£¬´Ëʱu=0£©µç×Ó´òµ½Ô²Í²¼Ç¼ֽÉϵĵã×÷Ϊxy×ø±êϵµÄÔ­µã£¬²¢È¡yÖáÊúÖ±ÏòÉÏ¡£ÊÔ¼ÆËãµç×Ó´òµ½¼Ç¼ֽÉϵÄ×î¸ßµãµÄy×ø±êºÍx×ø±ê¡££¨²»¼ÆÖØÁ¦×÷Óã©

£¨2£©ÔÚ¸ø³öµÄ×ø±êÖ½£¨Í¼3£©É϶¨Á¿µØ»­³öµç×Ó´òµ½¼Ç¼ֽÉϵĵãÐγɵÄͼÏß¡£

 

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸