ÌâÄ¿ÄÚÈÝ
ÔÚ×ø±êÔµãµÄ²¨Ô´S²úÉúÒ»ÁÐÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨£¬²¨ËÙv=400m/s¡£ÒÑÖªt=0ʱ£¬²¨¸ÕºÃ´«²¥µ½x=40m´¦£¬ÈçͼËùʾ¡£ÔÚx=400m´¦ÓÐÒ»½ÓÊÕÆ÷£¨Í¼ÖÐδ»³ö£©¡£ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ( )
A£®²¨Ô´S¿ªÊ¼Õñ¶¯Ê±·½ÏòÑØyÖḺ·½Ïò
B£®x=40m´¦µÄÖʵãÔÚt=0.025sʱλÒÆ×î´ó
C£®½ÓÊÕÆ÷ÔÚt=1sʱ²ÅÄܽÓÊÕµ½´Ë²¨
D£®²¨Ô´SÑØxÖḺ·½ÏòÔ˶¯£¬Ôò½ÓÊÕÆ÷½ÓÊÕµ½µÄ²¨µÄƵÂÊ»á±ä´ó
¡¾´ð°¸¡¿
A
¡¾½âÎö¡¿²¨ÏòÓÒ´«²¥£¬¸ÕºÃ´«²¥µ½40m´¦µÄÖʵ㣬¸ÃÖʵãÕñ¶¯·½ÏòÏòÏ£¬ÕñÔ´µÄÆðÕñ·½ÏòÒ²ÏòÏ£¬A¶Ô£»²¨³¤Îª20m£¬²¨ËÙΪ400m/s£¬ÖÜÆÚΪ0.05s£¬t=0.025sʱÖʵã40Õñ¶¯°ë¸öÖÜÆÚ£¬Õñ¶¯µ½Æ½ºâλÖã¬B´í£»¸Ã²¨ÔÚ1sʱ¼äÄÚ´«²¥¾àÀëΪvt=400m£¬ÕâÁв¨ÔÚ1sʱÒѾ´«²¥µ½440m´¦µÄÖʵ㣬C´í£»²¨Ô´SÑØxÖḺ·½ÏòÔ˶¯£¬Ôò½ÓÊÕÆ÷½ÓÊÕµ½µÄ²¨µÄƵÂÊ»á±äС£¬D´í£»
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
ÔÚ×ø±êÔµãµÄ²¨Ô´S²úÉúÒ»ÁÐÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨£¬²¨ËÙv=400m/s£®ÒÑÖªt=0ʱ£¬²¨¸ÕºÃ´«²¥µ½x=30m´¦£¬ÈçͼËùʾ£®ÔÚx=400m´¦ÓÐÒ»½ÓÊÕÆ÷£¨Í¼ÖÐδ»³ö£©£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢²¨Ô´S¿ªÊ¼Õñ¶¯µÄ·½ÏòÑØyÖáÕý·½Ïò | B¡¢x=30m´¦µÄÖʵãÔÚt=0.5sʱλÒÆ×î´ó | C¡¢x=20m´¦µÄÖʵãµÄÕñ¶¯ÆµÂÊÊÇ40Hz | D¡¢½ÓÊÕÆ÷ÔÚt=1sʱ²ÅÄܽÓÊÕµ½´Ë²¨ |
ÔÚ×ø±êÔµãµÄ²¨Ô´S²úÉúÒ»ÁÐÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨£¬²¨ËÙv=500m/s£®ÒÑÖªt=0ʱ£¬²¨¸ÕºÃ´«²¥µ½x=30m´¦£¬ÈçͼËùʾ£®ÔÚx=400m´¦ÓÐÒ»½ÓÊÕÆ÷£¨Í¼ÖÐδ»³ö£©£¬ÔòÏÂÁÐ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢²¨Ô´S¿ªÊ¼Õñ¶¯µÄ·½ÏòÑØyÖáÕý·½Ïò | B¡¢x=30m´¦µÄÖʵãÔÚt=0.5sʱµÄλÒÆΪÁã | C¡¢x=20m´¦µÄÖʵãÔÚt=0.5sʱÑØyÖḺ·½ÏòÔ˶¯ | D¡¢½ÓÊÕÆ÷ÔÚt=0.8sʱ²ÅÄܽÓÊÕµ½´Ë²¨ |