ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Èçͼ¼×Ëùʾ£¬¾øԵˮƽÃæÉϹ̶¨×ÅÁ½¸ù×ã¹»³¤µÄ¹â»¬½ðÊôµ¼¹ì PQ¡¢MN£¬Ïà¾àΪL=0.5m£¬efÓҲർ¹ì´¦ÓÚÔÈÇ¿´Å³¡ÖУ¬´Å³¡·½Ïò´¹Ö±µ¼¹ìƽÃæÏòÏ£¬´Å¸ÐӦǿ¶ÈBµÄ´óСÈçͼÒұ仯¡£¿ªÊ¼Ê± ab °ôºÍcd°ôËø¶¨ÔÚµ¼¹ìÈçͼ¼×λÖã¬ab°ôÓëcd°ôƽÐУ¬ab°ôÀëˮƽÃæ¸ß¶ÈΪh=0.2m£¬cd°ôÓëefÖ®¼äµÄ¾àÀëҲΪL£¬ab°ôµÄÖÊÁ¿Îªm1=0.2kg£¬ÓÐЧµç×èR1=0.05¦¸£¬cd°ôµÄÖÊÁ¿Îª m2=0.1kg£¬ÓÐЧµç×èΪ R2=0.15¦¸¡£Éèa¡¢b°ôÔÚÔ˶¯¹ý³ÌʼÖÕÓëµ¼¹ì´¹Ö±£¬Á½°ôÓëµ¼¹ì½Ó´¥Á¼ºÃ£¬µ¼¹ìµç×è²»¼Æ¡£g È¡10m/s2¡£ÎÊ£º
(1)0 ~1sʱ¼ä¶Îͨ¹ýcd°ôµÄµçÁ÷´óСÓë·½Ïò£¨cµ½d»òdµ½c£©
(2)¼ÙÈçÔÚ1sÄ©£¬Í¬Ê±½â³ý¶Ôab°ôºÍcd°ôµÄËø¶¨£¬´Ó½â³ýËø¶¨µ½Á½°ô×îÖÕÎȶ¨Ô˶¯Ê±£¬ab°ô¹²²úÉú¶àÉÙÈÈÁ¿£¿£¨½á¹ûÓ÷ÖÊý±íʾ£©
(3)ab°ôºÍcd°ôÎȶ¨Ô˶¯Ê±£¬ËüÃÇÖ®¼äµÄ¾àÀëΪ¶à´ó£¿£¨½á¹ûÓ÷ÖÊý±íʾ£©
¡¾´ð°¸¡¿£¨1£©1.25A£¬d¡úc£»£¨2£©£»£¨3£©
¡¾½âÎö¡¿
£¨1£©0¡«1sʱ¼ä¶Î£¬¸ù¾Ý·¨ÀµÚ¶¨Âɵãº
ͨ¹ýcd°ôµÄµçÁ÷´óСΪ£º
A
·½Ïòd¡úc¡£
£¨2£©ab°ôÏ»¬¹ý³Ì£¬ÓÉ»úеÄÜÊغ㶨Âɵãº
µÃ
ab°ô½øÈë´Å³¡ºó²úÉú¸ÐÓ¦µçÁ÷£¬Êܵ½Ïò×óµÄ°²ÅàÁ¦£¬×ö¼õËÙÔ˶¯£¬cd°ôÔÚ°²ÅàÁ¦×÷ÓÃÏÂÏòÓÒ¼ÓËÙÔ˶¯£¬Îȶ¨ºóab°ôºÍcd°ô½«ÒÔÏàͬµÄËÙ¶È×÷ÔÈËÙÖ±ÏßÔ˶¯£¬Á½°ô×é³ÉµÄϵͳËùÊܺϳåÁ¿ÎªÁ㣬ϵͳ¶¯Á¿±£³Ö²»±ä¡£
½âµÃÁ½°ôÎȶ¨Ê±¹²Í¬ËÙ¶ÈΪ
¸ù¾ÝÄÜÁ¿Êغ㶨ÂɵÃ
¡£
ab°ô²úÉúµÄÈÈÁ¿Îª
ÁªÁ¢½âµÃ
J
£¨3£©ÉèÕû¸öµÄ¹ý³ÌÖÐͨ¹ý»Ø·µÄµçºÉÁ¿Îªq£¬¶Ôcd°ô£¬Óɶ¯Á¿¶¨ÀíµÃ£º
ÓÖ
½âµÃ
C
ÉèÎȶ¨ºóÁ½°ôÖ®¼äµÄ¾àÀëÊÇd£¬ÔòÓÐ
ÁªÁ¢ÒÔÉÏÁ½Ê½µÃ
m
![](http://thumb2018.1010pic.com/images/loading.gif)