ÈçͼËùʾ,ÉùÔ´SºÍ¹Û²ìÕßA¶¼ÑØxÖáÕý·½ÏòÔ˶¯,Ïà¶ÔÓÚµØÃæµÄËÙÂÊ·Ö±ðΪvSºÍvA,¿ÕÆøÖÐÉùÒô´«²¥µÄËÙÂÊΪvP.ÉèvS£¼vP,vA£¼vP,¿ÕÆøÏà¶ÔÓÚµØÃæûÓÐÁ÷¶¯. 

СÌâ1:ÈôÉùÔ´Ïà¼Ì·¢³öÁ½¸öÉùÐźÅ,ʱ¼ä¼ä¸ôΪ¦¤t.Çë¸ù¾Ý·¢³öµÄÕâÁ½¸öÉùÐźŴÓÉùÔ´´«²¥µ½¹Û²ìÕߵĹý³Ì,È·¶¨¹Û²ìÕß½ÓÊÕµ½ÕâÁ½¸öÉùÐźŵÄʱ¼ä¼ä¸ô¦¤t¡ä.
СÌâ2:ÇëÀûÓã¨1£©µÄ½á¹û,ÍƵ¼´ËÇéÐÎϹ۲ìÕß½ÓÊÕµ½µÄÉù²¨ÆµÂÊÓëÉùÔ´·¢³öµÄÉù²¨ÆµÂʼäµÄ¹Øϵʽ.

СÌâ1:¦¤t¡ä£½¦¤t
СÌâ2:f¡ä£½f

СÌâ1:Éèt1¡¢t2ΪÉùÔ´S·¢³öµÄÁ½¸öÐźŵÄʱ¿Ì,t1¡ä¡¢t2¡äΪ¹Û²ìÕß½ÓÊÕµ½Á½¸öÐźŵÄʱ¿Ì,ÔòµÚÒ»¸öÐźž­¹ý£¨t1¡ä£­t1£©Ê±¼ä±»¹Û²ìÕßA½ÓÊÕµ½,µÚ¶þ¸öÐźž­¹ý£¨t2¡ä£­t2£©Ê±¼ä±»¹Û²ìÕßA½ÓÊÕµ½.ÇÒ
t2£­t1£½¦¤t                        t2¡ä£­t1¡ä£½¦¤t¡ä
       
ÉèÉùÔ´·¢³öµÚÒ»¸öÐźÅʱ,S¡¢AÁ½µã¼äµÄ¾àÀëΪL,Á½¸öÉùÐźŴÓÉùÔ´´«²¥µ½¹Û²ìÕߵĹý³ÌÖÐ,ËüÃÇÔ˶¯µÄ¾àÀë¹ØϵÈçͼËùʾ.¿ÉµÃ
vP£¨t1¡ä£­t1£©£½L£«vA£¨t1¡ä£­t1£©
vP£¨t2¡ä£­t2£©£½L£«vA£¨t2¡ä£­t1£©£­vS¦¤t
ÓÉÒÔÉϸ÷ʽ,µÃ¦¤t¡ä£½¦¤t
СÌâ2:ÉèÉùÔ´·¢³öÉù²¨µÄÕñ¶¯ÖÜÆÚΪT,ÕâÑù,ÓÉÒÔÉϽáÂÛ,¹Û²ìÕß½ÓÊÕµ½µÄÉù²¨Õñ¶¯µÄÖÜÆÚT¡äΪT¡ä£½T
Óɴ˿ɵÃ,¹Û²ìÕß½ÓÊÕµ½µÄÉù²¨ÆµÂÊÓëÉùÔ´·¢³öÉù²¨ÆµÂʼäµÄ¹ØϵΪ
f¡ä£½f
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

ÏÂÁйØÓÚ²¨µÄÓ¦ÓÃÕýÈ·µÄÊÇ(   )
A£®Òª½«·ÅÔÚºÓÖеÄÖ½´¬Ö𽥿¿½üºÓ°¶£¬¿ÉÏò±ÈÖ½´¬¸üÔ¶´¦Í¶ÖÀʯ×ÓÐγÉË®²¨
B£®Á½¸öÔÚË®ÖÐDZӾ²¢ÇÒ¿¿µÃ½Ï½üµÄÔ˶¯Ô±ÄÜÌýµ½¶Ô·½·¢³öµÄÉùÒôÊÇÉù²¨ÔÚÒºÌåÖд«²¥µÄÓ¦ÓÃ
C£®¹âÀÂÊÇÀûÓûúе²¨´«µÝÐÅÏ¢
D£®ÓԱÔÚÓîÖæ·É´¬À»÷´ò´¬±ÚÖ»ÄÜÒýÆð»úеÕñ¶¯£¬²»ÄÜÐγÉÉù²¨

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

ÈçͼËùʾ£¬Ò»Áмòгºá²¨ÑØxÖá´«²¥£¬a¡¢bÊÇxÖáÉÏÏà¾àΪ0.30mµÄÁ½µã¡£Ä³Ê±¿Ì£¬aÖʵãλÓÚƽºâλÖÃÏòÉÏÔ˶¯£¬bÖʵãÇ¡ºÃÔ˶¯µ½Ï·½×î´óλÒÆ´¦¡£ÒÑÖª¸Ã²¨µÄ´«²¥ËÙ¶ÈΪ60m/s£¬²¨³¤´óÓÚ0.30m¡£ÏÂÁÐÅжÏÕýÈ·µÄÊÇ                                                              
        
A£®Èô¸Ã²¨ÑØxÖḺ·½Ïò´«²¥£¬Ôò²¨³¤¿ÉÄÜΪ1.2m
B£®Èô¸Ã²¨ÑØxÖḺ·½Ïò´«²¥£¬ÔòƵÂÊΪ100Hz
C£®Èô¸Ã²¨ÑØxÖáÕý·½Ïò´«²¥£¬Ôò²¨³¤Ò»¶¨Îª0.40m
D£®Èô¸Ã²¨ÑØxÖáÕý·½Ïò´«²¥£¬ÔòƵÂÊÒ»¶¨Îª50Hz

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

Èçͼ23¼×Ëùʾ£¬Á½ÁÐÏàͬµÄ²¨ÏàÏò´«²¥£¬µ±ËüÃÇÏàÓöʱ£¬Í¼23ÒÒÖпÉÄܵIJ¨ÐÎÊÇ£º
A£®Í¼£¨a£©ºÍͼ(b);B£®Í¼£¨b£©ºÍͼ(c);
C£®Í¼£¨c£©ºÍͼ(d);D£®Í¼£¨a£©ºÍͼ(d)¡£

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

Ò»Áмòгºá²¨ÑØx ÖḺ·½Ïò´«²¥£¬Í¼¼×ÊÇt=1sʱµÄ²¨ÐÎͼ£¬Í¼ÒÒÊDz¨ÖÐijÕñ
¶¯ÖÊÔªÃÇÒÆËæʱ¼ä±ä»¯µÄÕñ¶¯Í¼Ïߣ¨Á½Í¼ÓÃͬһʱ¼äÆðµã£©£¬Ôòͼ2¿ÉÄÜÊÇͼ
1ÖÐÄĸöÖÊÔªµÄÕñ¶¯Í¼Ïߣ¿£¨ £©

¼×                                   ÒÒ
ͼ10¡ª8
A£®x =0´¦µÄÖÊÔªB£®x =1m´¦µÄÖÊÔª
C£®x =2m´¦µÄÖÊÔªD£®x =3m´¦µÄÖÊÔª

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

¹ØÓÚ»úеÕñ¶¯ºÍ»úе²¨µÄ¹Øϵ£¬ÒÔÏÂ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A£®ÓлúеÕñ¶¯±ØÓлúе²¨
B£®²¨Ô´Õñ¶¯Ê±µÄÔ˶¯ËٶȺͲ¨µÄ´«²¥ËÙ¶ÈʼÖÕÏàͬ
C£®ÓÉij²¨Ô´¼¤Æð»úе²¨£¬»úе²¨ºÍ²¨Ô´µÄƵÂÊʼÖÕÏàͬ
D£®Ò»µ©²¨Ô´Í£Ö¹Õñ¶¯£¬ÓÉËü¼¤ÆðµÄ»úе²¨Ò²Á¢¼´Í£Ö¹²¨¶¯

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

Ò»Áмòгºá²¨ÔÚ½éÖÊÄÚ´«²¥£¬Èô²¨Ô´ÖʵãͻȻֹͣÕñ¶¯£¬Ôò£¨¡¡¡¡£©
A£®ËùÓÐÖʵãÁ¢¼´Í£Ö¹Õñ¶¯
B£®ÒѾ­Õñ¶¯µÄÖʵ㽫¼ÌÐøÕñ¶¯£¬Î´Õñ¶¯µÄÖʵ㲻¿ÉÄÜÔÙÕñ¶¯
C£®ÄÜÁ¿¼ÌÐøÏòÔ¶´¦´«µÝ
D£®ÄÜÁ¿Á¢¼´Í£Ö¹´«µÝ

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºÌî¿ÕÌâ

ÈçͼËùʾΪһÁÐÕýÏÒ²¨µÄÒ»²¿·Ö£¬ÒÑÖªaµã½«ÏòÉÏÔ˶¯£¬Ôò¸Ã²¨Ó¦Ïò______·½Ïò´«²¥£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º²»Ïê ÌâÐÍ£ºµ¥Ñ¡Ìâ

ºá²¨ÑØÖ±Ïß´«²¥£¬²¨ËÙΪ2m/s£¬ÔÚ´«²¥·½ÏòÉÏÈ¡¼×¡¢ÒÒÁ½µã£¬´Ó²¨¸ÕºÃ´«µ½ËüÃÇÖÐijµãʱ¿ªÊ¼¼Æʱ£¬ÒÑÖª5sÄÚ¼×µãÍê³É8´ÎÈ«Õñ¶¯£¬ÒÒµãÍê³É10´ÎÈ«Õñ¶¯£¬Ôò²¨µÄ´«²¥·½ÏòºÍ¼×¡¢ÒÒÁ½µã¼äµÄ¾àÀëΪ£¨   £©
A£®¼×ÏòÒÒ£¬2£íB£®ÒÒÏò¼×£¬2£í
C£®¼×ÏòÒÒ£¬1.6£íD£®ÒÒÏò¼×£¬5£í

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸