ÌâÄ¿ÄÚÈÝ
![](http://thumb.1010pic.com/pic6/res/gzwl/web/STSource/20131029195311490130130/SYS201310291953114901301031_ST/images0.png)
£¨1£©Ð¡³µËùÊܵ½µÄ×èÁ¦£»
£¨2£©Ð¡³µÔÈËÙÐÐÊ»½×¶ÎÇ£ÒýÁ¦µÄ¹¦ÂÊ£»
£¨3£©Ð¡³µÔÚ¼ÓËÙÔ˶¯¹ý³ÌÖУ¨Ö¸Í¼ÏóÖÐ0¡«10ÃëÄÚ£©Î»ÒƵĴóС£®
¡¾´ð°¸¡¿·ÖÎö£º£¨1£©Ð¡³µÔÚ14s¡«18sÄÚˮƽ·½ÏòÉϽöÊÜ×èÁ¦£¬×öÔȼõËÙÖ±ÏßÔ˶¯£¬¸ù¾ÝËÙ¶Èʱ¼äͼÏßÇó³öÔȼõËÙÖ±ÏßÔ˶¯µÄ¼ÓËٶȣ¬ÔÙ¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³ö×èÁ¦µÄ´óС£®
£¨2£©µ±Ð¡³µÔÈËÙÐÐʻʱ£¬Ç£ÒýÁ¦µÈÓÚ×èÁ¦£¬¸ù¾ÝP=Fv=fvÇó³öÇ£ÒýÁ¦µÄ¹¦ÂÊ£®
£¨3£©0¡«2sÄÚµÄλÒÆ¿ÉÒÔ¸ù¾ÝͼÏßÓëʱ¼äÖáËùΧ³ÉµÄÃæ»ý½øÐÐÇó½â£¬2s¡«10sÄÚµÄλÒÆ£¬×¥×¡¹¦Âʲ»±ä£¬¸ù¾Ý¶¯Äܶ¨ÀíÇó³öλÒÆ£¬´Ó¶øµÃ³öС³µÔÚ¼ÓËÙÔ˶¯¹ý³ÌÖÐλÒƵĴóС£®
½â´ð£º
½â£º£¨1£©ÔÚ14s¡«18sʱ¼ä¶Î£¬ÓÉͼÏó¿ÉµÃ£º
![](http://thumb.1010pic.com/pic6/res/gzwl/web/STSource/20131029195311490130130/SYS201310291953114901301031_DA/0.png)
Ff=ma=-1.0×1.5N=-1.5N£¨¸ººÅ±íʾÁ¦µÄ·½ÏòÓëÔ˶¯·½ÏòÏà·´£©
£¨2£©ÔÚ10s¡«14sС³µ×öÔÈËÙÔ˶¯£¬Ç£ÒýÁ¦´óСFÓëFf´óСÏàµÈF=1.5N
P=Fv=1.5×6W=9W
£¨3£©ËÙ¶ÈͼÏóÓëºáÖáÖ®¼äµÄ¡°Ãæ»ý¡±µÈÓÚÎïÌåÔ˶¯µÄλÒÆ
0¡«2sÄÚ
×2×3m=3m
2s¡«10sÄÚ¸ù¾Ý¶¯Äܶ¨Àí
![](http://thumb.1010pic.com/pic6/res/gzwl/web/STSource/20131029195311490130130/SYS201310291953114901301031_DA/2.png)
½âµÃx2=39m
¡à¼ÓËÙ¹ý³ÌÖÐС³µµÄλÒÆ´óСΪ£ºx=x1+x2=42m
´ð£º£¨1£©Ð¡³µËùÊܵ½µÄ×èÁ¦Îª1.5N£®
£¨2£©Ð¡³µÔÈËÙÐÐÊ»½×¶ÎÇ£ÒýÁ¦µÄ¹¦ÂÊΪ9W£®
£¨3£©Ð¡³µÔÚ¼ÓËÙÔ˶¯¹ý³ÌÖÐλÒƵĴóСΪ42m£®
µãÆÀ£º½â¾ö±¾ÌâµÄ¹Ø¼üÄܹ»Í¨¹ýͼÏßÖªµÀС³µÔÚÕû¸öÔ˶¯¹ý³ÌÖеĹæÂÉ£¬×ÛºÏÅ£¶ÙµÚ¶þ¶¨ÂɺͶ¯Äܶ¨Àí½øÐÐÇó½â£®
£¨2£©µ±Ð¡³µÔÈËÙÐÐʻʱ£¬Ç£ÒýÁ¦µÈÓÚ×èÁ¦£¬¸ù¾ÝP=Fv=fvÇó³öÇ£ÒýÁ¦µÄ¹¦ÂÊ£®
£¨3£©0¡«2sÄÚµÄλÒÆ¿ÉÒÔ¸ù¾ÝͼÏßÓëʱ¼äÖáËùΧ³ÉµÄÃæ»ý½øÐÐÇó½â£¬2s¡«10sÄÚµÄλÒÆ£¬×¥×¡¹¦Âʲ»±ä£¬¸ù¾Ý¶¯Äܶ¨ÀíÇó³öλÒÆ£¬´Ó¶øµÃ³öС³µÔÚ¼ÓËÙÔ˶¯¹ý³ÌÖÐλÒƵĴóС£®
½â´ð£º
![](http://thumb.1010pic.com/pic6/res/gzwl/web/STSource/20131029195311490130130/SYS201310291953114901301031_DA/images0.png)
![](http://thumb.1010pic.com/pic6/res/gzwl/web/STSource/20131029195311490130130/SYS201310291953114901301031_DA/0.png)
Ff=ma=-1.0×1.5N=-1.5N£¨¸ººÅ±íʾÁ¦µÄ·½ÏòÓëÔ˶¯·½ÏòÏà·´£©
£¨2£©ÔÚ10s¡«14sС³µ×öÔÈËÙÔ˶¯£¬Ç£ÒýÁ¦´óСFÓëFf´óСÏàµÈF=1.5N
P=Fv=1.5×6W=9W
£¨3£©ËÙ¶ÈͼÏóÓëºáÖáÖ®¼äµÄ¡°Ãæ»ý¡±µÈÓÚÎïÌåÔ˶¯µÄλÒÆ
0¡«2sÄÚ
![](http://thumb.1010pic.com/pic6/res/gzwl/web/STSource/20131029195311490130130/SYS201310291953114901301031_DA/1.png)
2s¡«10sÄÚ¸ù¾Ý¶¯Äܶ¨Àí
![](http://thumb.1010pic.com/pic6/res/gzwl/web/STSource/20131029195311490130130/SYS201310291953114901301031_DA/2.png)
½âµÃx2=39m
¡à¼ÓËÙ¹ý³ÌÖÐС³µµÄλÒÆ´óСΪ£ºx=x1+x2=42m
´ð£º£¨1£©Ð¡³µËùÊܵ½µÄ×èÁ¦Îª1.5N£®
£¨2£©Ð¡³µÔÈËÙÐÐÊ»½×¶ÎÇ£ÒýÁ¦µÄ¹¦ÂÊΪ9W£®
£¨3£©Ð¡³µÔÚ¼ÓËÙÔ˶¯¹ý³ÌÖÐλÒƵĴóСΪ42m£®
µãÆÀ£º½â¾ö±¾ÌâµÄ¹Ø¼üÄܹ»Í¨¹ýͼÏßÖªµÀС³µÔÚÕû¸öÔ˶¯¹ý³ÌÖеĹæÂÉ£¬×ÛºÏÅ£¶ÙµÚ¶þ¶¨ÂɺͶ¯Äܶ¨Àí½øÐÐÇó½â£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿