µç´Å´òµã¼ÆʱÆ÷ÊÇÒ»ÖÖʹÓý»Á÷µçÔ´µÄ¼ÆʱÒÇÆ÷£¬µ±µçÔ´µÄƵÂÊÊÇ50Hzʱ£¬Ëüÿ¸ô0.2s´òÒ»´Îµã£®Ä³Í¬Ñ§ÔÚÓôòµã¼ÆʱÆ÷²â¶¨ÎïÌåÑØбÃæ×öÔȱäËÙÖ±ÏßÔ˶¯Ê±£¬µÃµ½ÁËÈçͼËùʾµÄÖ½´ø£¬´ÓAµã¿ªÊ¼£¬Ã¿¸ôÁ½¸ö¼ÆʱµãÈ¡Ò»¸ö¼ÆÊýµã£®·ÖÎö¿ÉÖª£ºÐ¡Çò´ÓAµãµ½Fµã×öµÄÊÇ
±äËÙÖ±Ïß
±äËÙÖ±Ïß
Ô˶¯£¨Ñ¡¡°ÔÈËÙÖ±Ïß¡±»ò¡°±äËÙÖ±Ïß¡±£©£®Ð¡Çò´ÓBµãµ½FµãÔ˶¯µÄ·³ÌÊÇ
12
12
cm£¬Æ½¾ùËÙ¶ÈÊÇ
0.5
0.5
m/s£®
·ÖÎö£ºÃ¿¸ôÁ½¸ö¼ÆʱµãÈ¡Ò»¸ö¼ÆÊýµã£¬ËùÒÔÏàÁÚ¼ÆÊýµã¼äµÄ¼ä¸ô¶¼ÊÇt0-3¡Á0.02s=0.06s£¬´ÓÖ½´ø¿ÉÒÔ¿´³ö£ºÏàµÈʱ¼äÄÚСÇòͨ¹ýµÄ¾àÀëÔ½À´Ô½´ó£¬Òò´ËСÇòµÄËÙ¶ÈÔ½À´Ô½´ó£¬×öµÄÊDZäËÙÖ±ÏßÔ˶¯£®
½â´ð£º½â£ºÓÉͼÖÐÊý¾Ý¿ÉÖª£¬ÏàÁڵļÆÊýµãµÄ¾àÀëÔÚÔö´ó£¬ËùÒÔÖ½´øµÄÔ˶¯ÊDZäËÙÖ±ÏßÔ˶¯£¬
´ÓÖ½´ø¿ÉÒÔ¿´³ö£ºÐ¡Çò´ÓBµãµ½FµãÔ˶¯µÄ·³Ìs=12cm£¬¾­ÀúµÄʱ¼äΪt=4¡Á0.06s=0.24s£®
Ôòv=
s
t
=
0.12m
0.24s
=0.5m/s£®
¹Ê´ð°¸Îª£º±äËÙÖ±Ïߣ»12£»0.5£®
µãÆÀ£ºÒªÌá¸ßÓ¦ÓÃÔȱäËÙÖ±ÏߵĹæÂÉÒÔ¼°ÍÆÂÛ½â´ðʵÑéÎÊÌâµÄÄÜÁ¦£¬ÔÚƽʱÁ·Ï°ÖÐÒª¼ÓÇ¿»ù´¡ÖªÊ¶µÄÀí½âÓëÓ¦Óã®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

ͬ²½Á·Ï°²á´ð°¸