Question

11£®ÕâÊÇijʵÑéС×é¡°²âÁ¿Æ½¾ùËٶȡ±µÄÇé¾°£º

£¨1£©²âÁ¿Æ½¾ùËٶȵÄÔ­ÀíÊÇ£ºv=$\frac{s}{t}$£®
£¨2£©ÊµÑéÖÐΪÁË·½±ã¼Æʱ£¬Ó¦Ê¹Ð±ÃæµÄƶȽÏС£¨Ñ¡Ì¡°´ó¡±»ò¡°Ð¡¡±£©£®
£¨3£©Ð¡³µ´ÓBµ½CµÄ¾àÀëÊÇ£º4.80dm£®
£¨4£©Ð¡³µ´ÓAµ½CËùÓõÄʱ¼äÊÇ£º3s£¬È«³Ìƽ¾ùËÙ¶ÈÊÇ£º0.29m/s£®
£¨5£©ÔÚÕâ¸ö¹ý³ÌÖУ¬±ØÐëÊìÁ·µÄʹÓõç×Ó¼ÆʱÆ÷£¬Èç¹ûС³µ¹ýÁËAµã²Å¿ªÊ¼¼Æʱ£¬»áʹ²âµÃµÄƽ¾ùËÙ¶ÈÆ«´ó£¨Ñ¡Ì¡°´ó¡±»ò¡°Ð¡¡±£©£®

Answer 1

·ÖÎö £¨1£©²âС³µµÄƽ¾ùËٶȣ¬²â³ö·³ÌÓëÔ˶¯Ê±¼ä£¬ÓÉËٶȹ«Ê½v=$\frac{s}{t}$¿ÉÒÔÇó³öËٶȣ®
£¨2£©ÈôÒª¼Æʱ·½±ã£¬Ó¦ÈÃϳµÏ»¬ËÙ¶ÈÂýЩ£¬Ô˶¯µÄʱ¼ä³¤Ð©£»
£¨3£©ÓÉͼʾ¿Ì¶È³ßÈ·¶¨¿Ì¶È³ßµÄ×îС·Ö¶ÈÖµ£¬ÓÉͼ¶Á³öС³µÇ°¶ËÔÚBλÖÃÓëCλÖÃËù¶ÔÓ¦¿Ì¶È³ßµÄʾÊý£¬Á½Ê¾ÊýÖ®²îµÈÓÚС³µµÄ·³Ì£»
£¨4£©´ÓͼÖжÁ³öС³µ´ÓAµ½CËùÓõÄʱ¼äºÍ·³Ì£¬È»ºóÀûÓÃËٶȹ«Ê½Çó½âÈ«³ÌµÄƽ¾ùËٶȣ»
£¨5£©ÈÃС³µ¹ýÁËAµã²Å¿ªÊ¼¼Æʱ£¬»áµ¼ÖÂʱ¼äµÄ²âÁ¿½á¹ûƫС£¬Æ½¾ùËٶȻáÆ«´ó£®

½â´ð ½â£º£¨1£©²âС³µµÄƽ¾ùËÙ¶ÈʵÑ飬ÊǸù¾Ý¹«Ê½v=$\frac{s}{t}$½øÐвâÁ¿µÄ£»
£¨2£©Ð±ÃæƶÈÔ½´ó£¬Ð¡³µÑØбÃæÏòϼÓËÙÔ˶¯Ô½¿ì£¬¹ýijµãµÄʱ¼ä»áÔ½¶Ì£¬¼Æʱ»áÔ½À§ÄÑ£»ËùÒÔΪʹ¼Æʱ·½±ã£¬Ð±ÃæƶÈӦСһЩ£»
£¨3£©ÓÉͼ֪£¬¿Ì¶È³ßµÄ×îС·Ö¶ÈÖµÊÇ1cm£¬
ÓÉBµ½CС³µµÄ·³Ìs_BC=6.00dm-1.20dm=4.80dm£»
£¨4£©ÓÉͼ֪£¬Ð¡³µ´ÓAµ½CµÄ·³Ìs_AC=10.00dm-1.20dm=8.80dm£¬t_AC=3s£¬
ÔòÈ«³Ìƽ¾ùËÙ¶ÈÊÇv_AC=$\frac{{s}_{AC}}{{t}_{AC}}$=$\frac{8.80dm}{3s}$¡Ö0.29dm/s£»
£¨5£©ÈÃС³µ¹ýÁËAµãºó²Å¿ªÊ¼¼Æʱ£¬¼ÆʱÍí£¬¹ÊËù¼Æʱ¼äƫС£¬ÓÉv=$\frac{s}{t}$¿ÉÖª¼ÆËã³öµÄƽ¾ùËÙ¶ÈÆ«´ó£®
¹Ê´ð°¸Îª£º£¨1£©v=$\frac{s}{t}$½øv=£»£¨2£©Ð¡£»£¨3£©4.80£»£¨4£©3s£»0.29£»£¨5£©´ó£®

µãÆÀ ¡°²âС³µµÄƽ¾ùËٶȡ±µÄʵÑéÔ­ÀíÊÇv=$\frac{s}{t}$£¬Ñ§»á·ÖÎöʵÑéÆ÷²ÄµÄʹÓã¬ÊÇÒ»µÀ¶ÔʵÑé²Ù×÷µÄ¿¼²éÊÔÌ⣮