ÌâÄ¿ÄÚÈÝ
12£®ÔÚ¡¶ÑéÖ¤»úеÄÜÊغ㶨ÂÉ¡·ÊµÑéÖУ¬Á½ÊµÑéС×éͬѧ·Ö±ð²ÉÓÃÁËÈçͼ¼×ºÍÒÒËùʾµÄ×°Öã¬ÓÃÁ½ÖÖ²»Í¬µÄʵÑé·½°¸½øÐÐʵÑ飮¢ÙÔÚ¼×ͼÖУ¬ÏÂÂäÎïÌåӦѡÔñÃܶȽϴóµÄÖØÎÔÚÒÒͼÖУ¬Á½¸öÖØÎïµÄÖÊÁ¿¹ØϵÊÇ£ºm1£®£¾m2£¨Ñ¡Ìî¡°£¾¡±¡¢¡°=¡±»ò¡°£¼¡±£©£»
¢ÚÈô²ÉÓÃͼÒҵķ½°¸½øÐÐʵÑ飬³ýͼÖеÄÆ÷²ÄÍ⣬»¹ÐèÒªµÄʵÑéÆ÷²ÄÓУºÆµÂÊΪ50Hz½»Á÷µçÔ´¡¢¿Ì¶È³ßºÍÌìƽ£¬
¢Ûij´ÎʵÑéËù´òÖ½´øÈçͼ±ûËùʾ£¬OΪµÚÒ»¸öµã£¬A¡¢B¡¢C¡¢Dµãµ½OµãµÄ¾àÀëÒѱê³ö£¬´òµãʱ¼ä¼ä¸ôΪ0.02s£¬Ôò¼Ç¼Cµãʱ£¬ÖØÎïËÙ¶Èvc=0.78m/s£®£®
·ÖÎö 1¡¢2¡¢ÔÚÑéÖ¤»úеÄÜÊغ㶨ÂɵÄʵÑéÖУ¬Ó¦Ñ¡ÔñÖÊÁ¿´ó£¬Ìå»ýСµÄÎïÌå×÷ΪÖØÎÒÒͼÊÇÑé֤ϵͳ»úеÄÜÊغ㣬ͨ¹ýʵÑéµÄÔÀíÈ·¶¨²âÁ¿µÄÆ÷²Ä£®
3¡¢¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯ÖÐʱ¼äÖеãµÄËٶȵÈÓڸùý³ÌÖеÄƽ¾ùËٶȣ¬¿ÉÒÔÇó³ö´òÖ½´øÉÏCµãʱС³µµÄ˲ʱËٶȴóС£®
½â´ð ½â£º£¨1£©ÎªÁ˼õСʵÑéµÄÎó²î£¬ÒÒͼÊÇÑé֤ϵͳ»úеÄÜÊÇ·ñÊغ㣬m1ÏòÏÂÔ˶¯£¬m2ÏòÉÏÔ˶¯£¬
ËùÒÔm1£¾m2£®
£¨2£©Ñé֤ϵͳ»úеÄÜÊÇ·ñÊغ㣬¼´Ñé֤ϵͳ¶¯ÄܵÄÔö¼ÓÁ¿ºÍϵͳÖØÁ¦ÊÆÄܵļõСÁ¿ÊÇ·ñÏàµÈ£¬¶¯ÄܵÄÔö¼ÓÁ¿Îª¡÷Ek=$\frac{1}{2}$£¨m1+m2£©v2£¬
ÖØÁ¦ÊÆÄܵļõСÁ¿Îª¡÷EP=£¨m1-m2£©gh£®
¿ÉÖªÐèÒª²âÁ¿Á½¸öÖØÎïµÄÖÊÁ¿£¬ËùÒÔʵÑéÆ÷²Ä»¹ÐèÒªÌìƽ£®
£¨3£©¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯ÖÐʱ¼äÖеãµÄËٶȵÈÓڸùý³ÌÖеÄƽ¾ùËٶȣ¬¿ÉÒÔÇó³ö´òÖ½´øÉÏCµãʱС³µµÄ˲ʱËٶȴóС£®
vC=$\frac{{x}_{BD}}{2T}$=$\frac{0.049-0.0178}{2¡Á0.02}$=0.780m/s
¹Ê´ð°¸Îª£º£¨1£©£¾£»
£¨2£©Ììƽ£»
£¨3£©0.780£®
µãÆÀ ½â¾ö±¾ÌâµÄ¹Ø¼üÖªµÀʵÑéµÄÔÀí£¬Í¨¹ýÔÀíÈ·¶¨²âÁ¿µÄÆ÷²ÄÒÔ¼°Îó²îµÄÀ´Ô´£®
ÒªÌá¸ßÓ¦ÓÃÔȱäËÙÖ±ÏߵĹæÂÉÒÔ¼°ÍÆÂÛ½â´ðʵÑéÎÊÌâµÄÄÜÁ¦£¬ÔÚƽʱÁ·Ï°ÖÐÒª¼ÓÇ¿»ù´¡ÖªÊ¶µÄÀí½âÓëÓ¦Óã®
A£® | ͼÖÐa¶ËÓ¦ÊǵçÔ´µÄÕý¼« | |
B£® | Ö»ÒªÓйâÕÕÉäK£¬ÏÎÌú¾Í±»µç´ÅÌúÎüÒý | |
C£® | Ö»ÒªÕÕÉäKµÄ¹âÇ¿¶È×ã¹»´ó£¬ÏÎÌú¾Í±»µç´ÅÌúÎüÒý | |
D£® | Ö»ÓÐÕÕÉäKµÄ¹âƵÂÊ×ã¹»´ó£¬ÏÎÌú²Å±»µç´ÅÌúÎüÒý |
A£® | µçѹ±íVµÄʾÊýÔö´ó | B£® | µçÁ÷±íAµÄʾÊýÔö´ó | ||
C£® | µçÈÝÆ÷CËù´øµÄµçºÉÁ¿¼õС | D£® | µç×èR1µÄµç¹¦ÂÊÔö´ó |