ÌâÄ¿ÄÚÈÝ

4£®Ä³Í¬Ñ§ÔÚ¡°Ì½¾¿Ð¡³µËÙ¶ÈËæÊ±¼ä±ä»¯µÄ¹æÂÉ¡±µÄʵÑéÖУ¬ËùÓý»Á÷µçµÄÖÜÆÚΪT=0.02s£®´òµã¼ÆÊ±Æ÷¼Ç¼Á˱»Ð¡³µÍ϶¯µÄÖ½´øµÄÔ˶¯Çé¿ö£¬ÔÚÖ½´øÉÏÈ·¶¨³öA¡¢B¡¢C¡¢D¡¢E¡¢F¡¢G¹²7¸ö¼ÆÊýµã£®ÆäÏàÁÚµã¼äµÄ¾àÀ루¿ÉÒÀ´ÎÓÃ×Öĸx1¡¢x2¡¢x3¡¢x4¡¢x5¡¢x6±íʾ£©ÈçͼËùʾ£¬Ã¿Á½¸öÏàÁڵļÆÊýµãÖ®¼ä»¹ÓÐ4¸ö´òÓ¡µãδ»­³ö£®

£¨1£©ÊÔ¸ù¾ÝÖ½´øÉϸ÷¸ö¼ÆÊýµã¼äµÄ¾àÀ룬¼ÆËã³ö´òÏÂBµãС³µµÄ˲ʱËÙ¶È£¬vB=0.38£¨ÒªÇó±£Áô2λÓÐЧÊý×Ö£©
£¨2£©Çëд³ö¼ÆËãС³µ¼ÓËٶȵıí´ïʽ£º$a=\frac{£¨{x}_{4}^{\;}+{x}_{5}^{\;}+{x}_{6}^{\;}£©-£¨{x}_{1}^{\;}+{x}_{2}^{\;}+{x}_{3}^{\;}£©}{9{T}_{\;}^{2}}$£¨ÓÃ×Öĸx1¡¢x2¡¢x3¡¢x4¡¢x5¡¢x6ºÍT±íʾ£©£®±íʾ³öС³µ¼ÓËÙ¶ÈΪ1.19m/s2£¨±£ÁôСÊýµãºóÃæ¶þλÊý×Ö£©£®

·ÖÎö £¨1£©¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯ÖÐʱ¼äÖеãµÄËٶȵÈÓڸùý³ÌÖÐµÄÆ½¾ùËÙ¶È£¬¿ÉÒÔÇó³ö´òÖ½´øÉÏB¡¢FµãʱС³µµÄ˲ʱËÙ¶È´óС£®
£¨2£©¸ù¾ÝÖð²î·¨Çó½â¼ÓËÙ¶È£®

½â´ð ½â£º£¨1£©Ã¿Á½¸öÏàÁÚ¼ÆÊýµãÖ®¼ä»¹ÓÐËĸöµãδ»­³ö£¬ËùÒÔÏàÁڵļÆÊýµã¼äµÄʱ¼ä¼ä¸ôT=0.1s£®
¸ù¾ÝÔȱäËÙÖ±ÏßÔ˶¯ÖÐʱ¼äÖеãµÄËٶȵÈÓڸùý³ÌÖÐµÄÆ½¾ùËÙ¶È£¬
vB=$\frac{{x}_{AC}^{\;}}{2T}$=$\frac{3.18cm+4.36cm}{2¡Á0.1s}=38cm/s$=0.38m/s£¬
£¨2£©¸ù¾ÝÖð²î·¨Çó¼ÓËÙ¶È
${x}_{4}^{\;}-{x}_{1}^{\;}=3{a}_{1}^{\;}{T}_{\;}^{2}$¢Ù
${x}_{5}^{\;}-{x}_{2}^{\;}=3{a}_{2}^{\;}{T}_{\;}^{2}$¢Ú
${x}_{6}^{\;}-{x}_{3}^{\;}=3{a}_{3}^{\;}{T}_{\;}^{2}$¢Û
$a=\frac{{a}_{1}^{\;}+{a}_{2}^{\;}+{a}_{3}^{\;}}{3}$¢Ü
ÁªÁ¢µÃ$a=\frac{£¨{x}_{4}^{\;}+{x}_{5}^{\;}+{x}_{6}^{\;}£©-£¨{x}_{1}^{\;}+{x}_{2}^{\;}+{x}_{3}^{\;}£©}{9{T}_{\;}^{2}}$
´úÈëÊý¾ÝµÃ£º$a=\frac{£¨6.74cm+7.92cm+9.12cm£©-£¨3.18cm+4.36cm+5.55cm£©}{£¨3¡Á0.1s£©_{\;}^{2}}$=119$cm/{s}_{\;}^{2}$=$1.19m/{s}_{\;}^{2}$
¹Ê´ð°¸Îª£º£¨1£©0.38   £¨2£©$a=\frac{£¨{x}_{4}^{\;}+{x}_{5}^{\;}+{x}_{6}^{\;}£©-£¨{x}_{1}^{\;}+{x}_{2}^{\;}+{x}_{3}^{\;}£©}{9{T}_{\;}^{2}}$            1.19

µãÆÀ ÒªÌá¸ßÓ¦ÓÃÔȱäËÙÖ±ÏߵĹæÂÉÒÔ¼°ÍÆÂÛ½â´ðʵÑéÎÊÌâµÄÄÜÁ¦£¬ÔÚÆ½Ê±Á·Ï°ÖÐÒª¼ÓÇ¿»ù´¡ÖªÊ¶µÄÀí½âÓëÓ¦Óã®
ҪעÒⵥλµÄ»»ËãºÍÓÐЧÊý×ֵı£Áô£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø