ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ£¬ÔÚµÚÒ»ÏóÏÞÇøÓòÄÚÓд¹Ö±ÓÚÖ½ÃæÏòÀïµÄÔÈÇ¿´Å³¡£¬´Å¸ÐӦǿ¶È´óСB=2.0¡Á10-3T£¬Ò»´øÕýµçºÉµÄÁ£×ÓAÒÔv=3.5¡Á104m/sµÄËÙÂÊ´ÓxÖáÉϵÄP£¨0.50£¬0£©´¦ÒÔÓëxÖáÕý·½Ïò³Éijһ½Ç¶ÈµÄ·½Ïò´¹Ö±ÉäÈë´Å³¡£¬´Ó
yÖáÉϵÄM£¨0£¬0.50£©´¦Éä³ö´Å³¡£¬ÇÒÔ˶¯¹ì¼£µÄ°ë¾¶ÊÇËùÓпÉÄܰ뾶ֵÖеÄ×îСֵ£®ÉèÁ£×ÓAµÄÖÊÁ¿Îªm¡¢µçºÉÁ¿Îªq£®²»¼ÆÁ£×ÓµÄÖØÁ¦£®
£¨1£©ÇóÁ£×ÓAµÄ±ÈºÉ
£»£¨¼ÆËã½á¹ûÇë±£ÁôÁ½Î»ÓÐЧÊý×Ö£¬ÏÂͬ£©
£¨2£©Èç¹ûÁ£×ÓAÔ˶¯¹ý³ÌÖеÄij¸öʱ¿Ì£¬ÔÚµÚÒ»ÏóÏÞÄÚÔÙ¼ÓÒ»¸öÔÈÇ¿µç³¡£¬¾Í¿ÉÒÔʹÆä´ËºóÑØxÖḺ·½Ïò×öÔÈËÙÖ±ÏßÔ˶¯²¢À뿪µÚÒ»ÏóÏÞ£¬Çó¸ÃÔÈÇ¿µç³¡µÄ³¡Ç¿´óСºÍ·½Ïò£¬²¢Çó³öÁ£×ÓÉä³ö´Å³¡´¦µÄ×ø±êÖµ£»
£¨3£©Èç¹ûÒªÁ£×ÓA°´Ìâ¸ÉÒªÇó´ÓM´¦Éä³ö´Å³¡£¬µÚÒ»ÏóÏÞÄڵĴų¡¿ÉÒÔ¾ÖÏÞÔÚÒ»¸ö×îСµÄ¾ØÐÎÇøÓòÄÚ£¬Çó³öÕâ¸ö×îСµÄ¾ØÐÎÇøÓòµÄÃæ»ý£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102127282874606.png)
yÖáÉϵÄM£¨0£¬0.50£©´¦Éä³ö´Å³¡£¬ÇÒÔ˶¯¹ì¼£µÄ°ë¾¶ÊÇËùÓпÉÄܰ뾶ֵÖеÄ×îСֵ£®ÉèÁ£×ÓAµÄÖÊÁ¿Îªm¡¢µçºÉÁ¿Îªq£®²»¼ÆÁ£×ÓµÄÖØÁ¦£®
£¨1£©ÇóÁ£×ÓAµÄ±ÈºÉ
q |
m |
£¨2£©Èç¹ûÁ£×ÓAÔ˶¯¹ý³ÌÖеÄij¸öʱ¿Ì£¬ÔÚµÚÒ»ÏóÏÞÄÚÔÙ¼ÓÒ»¸öÔÈÇ¿µç³¡£¬¾Í¿ÉÒÔʹÆä´ËºóÑØxÖḺ·½Ïò×öÔÈËÙÖ±ÏßÔ˶¯²¢À뿪µÚÒ»ÏóÏÞ£¬Çó¸ÃÔÈÇ¿µç³¡µÄ³¡Ç¿´óСºÍ·½Ïò£¬²¢Çó³öÁ£×ÓÉä³ö´Å³¡´¦µÄ×ø±êÖµ£»
£¨3£©Èç¹ûÒªÁ£×ÓA°´Ìâ¸ÉÒªÇó´ÓM´¦Éä³ö´Å³¡£¬µÚÒ»ÏóÏÞÄڵĴų¡¿ÉÒÔ¾ÖÏÞÔÚÒ»¸ö×îСµÄ¾ØÐÎÇøÓòÄÚ£¬Çó³öÕâ¸ö×îСµÄ¾ØÐÎÇøÓòµÄÃæ»ý£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/201406102127282874606.png)
£¨1£©¸ÃÁ£×ÓÔڴų¡ÖÐÔ˶¯°ë¾¶Îªr£¬Èçͼ¼×£¬ÒÀÌâÒâMPÁ¬Ïß¼´Îª¸ÃÁ£×ÓÔڴų¡ÖÐ×öÔÈËÙÔ²ÖÜÔ˶¯µÄ×îСֱ¾¶£¬Óɼ¸ºÎ¹ØϵµÃ£º
r=
| ||||
2 |
| ||
4 |
Á£×ÓÔ²ÖÜÔ˶¯µÄÏòÐÄÁ¦ÓÉÂåÂ××ÈÁ¦Ìṩ£¬¹ÊÓУº
qvB=m
v2 |
r |
ÓÉ¢Ù¢Ú½âµÃ
q |
m |
v |
Br |
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061021272884919822.png)
£¨2£©ÉèËù¼Óµç³¡µÄ³¡Ç¿´óСΪE£¬ÈçͼÒÒËùʾ£¬µ±Á£×Ó¾¹ýQµãʱ£¬ËÙ¶ÈÑØxÖḺ·½Ïò£¬ÒÀÌâÒ⣬ÔÚ´Ëʱ¼ÓÒ»¸öÑØyÖáÕý·½ÏòµÄÔÈÇ¿µç³¡¡¢µç³¡Á¦ÓëÂåÂ××ÈÁ¦Æ½ºâÔòÓУº
Eq=qvB
´úÈëÊý¾ÝµÃ£ºE=70N/C
Ëù¼Óµç³¡µÄ³¡Ç¿·½ÏòÑØyÖáÕý·½Ïò£®
Óɼ¸ºÎ¹Øϵ¿ÉÖª£¬Ô²»¡MQËù¶ÔÓ¦µÄÔ²ÐĽÇΪ45¡ãÔòÉä³öµãA¶ÔÓ¦yÖá½Ø¾àΪ£º
|OA|=r+
1 |
2 |
. |
OP |
| ||
4 |
0.5 |
2 |
ËùÒÔÁ£×ÓÉä³ö´Å³¡´¦AµãµÄ×ø±êΪ£¨0£¬0.60£©
£¨3£©Èçͼ±û£¬
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061021272897421008.png)
¸ÃÇøÓòÃæ»ýΪ£ºs=2r2£¬´úÈër=0.35¿ÉµÃ£º
s=0.25m2
´ð£º£¨1£©Á£×ÓAµÄ±ÈºÉ
q |
m |
£¨2£©Èç¹ûÁ£×ÓAÔ˶¯¹ý³ÌÖеÄij¸öʱ¿Ì£¬ÔÚµÚÒ»ÏóÏÞÄÚÔÙ¼ÓÒ»¸öÔÈÇ¿µç³¡£¬¾Í¿ÉÒÔʹÆä´ËºóÑØxÖḺ·½Ïò×öÔÈËÙÖ±ÏßÔ˶¯²¢À뿪µÚÒ»ÏóÏÞ£¬Çó¸ÃÔÈÇ¿µç³¡µÄ³¡Ç¿´óСºÍ·½Ïò£¬Á£×ÓÉä³ö´Å³¡´¦µÄ×ø±êÖµ£¨0£¬0.6£©£»
£¨3£©Èç¹ûÒªÁ£×ÓA°´Ìâ¸ÉÒªÇó´ÓM´¦Éä³ö´Å³¡£¬µÚÒ»ÏóÏÞÄڵĴų¡¿ÉÒÔ¾ÖÏÞÔÚÒ»¸ö×îСµÄ¾ØÐÎÇøÓòÄÚ£¬Õâ¸ö×îСµÄ¾ØÐÎÇøÓòµÄÃæ»ýs=0.25m2£®
![](http://thumb.1010pic.com/pic2/upload/papers/20140610/2014061021272937919545.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿