ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ,×ø±êϵxOyλÓÚÊúֱƽÃæÄÚ,ÔÚ¸ÃÇøÓòÄÚÓг¡Ç¿E="12" N/C?·½ÏòÑØxÖáÕý·½ÏòµÄÔÈÇ¿µç³¡ºÍ´Å¸ÐӦǿ¶È´óСΪB=2T?ÑØˮƽ·½ÏòÇÒ´¹Ö±ÓÚxOyƽÃæÖ¸ÏòÖ½ÀïµÄÔÈÇ¿´Å³¡.Ò»¸öÖÊÁ¿m=4¡Á10-5 kg,µçÁ¿q=2.5¡Á10-5C´øÕýµçµÄ΢Á£,ÔÚxOyƽÃæÄÚ×öÔÈËÙÖ±ÏßÔ˶¯,Ô˶¯µ½ÔµãOʱ,³·È¥´Å³¡,¾Ò»¶Îʱ¼äºó,´øµç΢Á£Ô˶¯µ½ÁËxÖáÉϵÄPµã.È¡g="10" m/s2,Çó:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425079946601.jpg)
(1)Pµãµ½ÔµãOµÄ¾àÀë;
(2)´øµç΢Á£ÓÉÔµãOÔ˶¯µ½PµãµÄʱ¼ä.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425079946601.jpg)
(1)Pµãµ½ÔµãOµÄ¾àÀë;
(2)´øµç΢Á£ÓÉÔµãOÔ˶¯µ½PµãµÄʱ¼ä.
(1)15 m (2)1.2 s
΢Á£Ô˶¯µ½Oµã֮ǰҪÊܵ½ÖØÁ¦?µç³¡Á¦ºÍÂåÂ××ÈÁ¦×÷ÓÃ,ÔÚÕâ¶Îʱ¼äÄÚ΢Á£×öÔÈËÙÖ±ÏßÔ˶¯,˵Ã÷ÈýÁ¦ºÏÁ¦ÎªÁã.
Óɴ˿ɵÃ
¢Ù
µç³¡Á¦FE=Eq ¢Ú
ÂåÂ××ÈÁ¦FB=Bqv ¢Û
ÁªÁ¢Çó½â?´úÈëÊý¾ÝµÃv="10" m/s ¢Ü
΢Á£Ô˶¯µ½OµãÖ®ºó,³·È¥´Å³¡,΢Á£Ö»Êܵ½ÖØÁ¦?µç³¡Á¦×÷ÓÃ,ÆäºÏÁ¦ÎªÒ»ºãÁ¦,ÇÒ·½ÏòÓë΢Á£ÔÚOµãµÄËٶȷ½Ïò´¹Ö±,ËùÒÔ΢Á£ÔÚºóÒ»¶Îʱ¼äÄÚµÄÔ˶¯ÎªÀàƽÅ×Ô˶¯,¿ÉÑسõËٶȷ½ÏòºÍºÏÁ¦·½Ïò½øÐзֽâ.
tan¦È=
¢Ý
´úÈëÊý¾ÝµÃtan¦È=
¢Þ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425083998865.jpg)
ÉèÑسõËٶȷ½ÏòµÄλÒÆΪs1,ÑغÏÁ¦·½ÏòµÄλÒÆΪs2,ÔòÒòΪ
s1=vt ¢ß
s2=
t2 ¢à
¢á
ÁªÁ¢Çó½â,´úÈëÊý¾Ý¿ÉµÃPµãµ½ÔµãOµÄ¾àÀë
OP="15" m
Oµãµ½PµãÔ˶¯Ê±¼ä
t="1.2" s.
Óɴ˿ɵÃ
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142508103835.png)
µç³¡Á¦FE=Eq ¢Ú
ÂåÂ××ÈÁ¦FB=Bqv ¢Û
ÁªÁ¢Çó½â?´úÈëÊý¾ÝµÃv="10" m/s ¢Ü
΢Á£Ô˶¯µ½OµãÖ®ºó,³·È¥´Å³¡,΢Á£Ö»Êܵ½ÖØÁ¦?µç³¡Á¦×÷ÓÃ,ÆäºÏÁ¦ÎªÒ»ºãÁ¦,ÇÒ·½ÏòÓë΢Á£ÔÚOµãµÄËٶȷ½Ïò´¹Ö±,ËùÒÔ΢Á£ÔÚºóÒ»¶Îʱ¼äÄÚµÄÔ˶¯ÎªÀàƽÅ×Ô˶¯,¿ÉÑسõËٶȷ½ÏòºÍºÏÁ¦·½Ïò½øÐзֽâ.
tan¦È=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142508197579.png)
´úÈëÊý¾ÝµÃtan¦È=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142508259385.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241425083998865.jpg)
ÉèÑسõËٶȷ½ÏòµÄλÒÆΪs1,ÑغÏÁ¦·½ÏòµÄλÒÆΪs2,ÔòÒòΪ
s1=vt ¢ß
s2=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142508462990.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142508555679.png)
ÁªÁ¢Çó½â,´úÈëÊý¾Ý¿ÉµÃPµãµ½ÔµãOµÄ¾àÀë
OP="15" m
Oµãµ½PµãÔ˶¯Ê±¼ä
t="1.2" s.
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿