ÌâÄ¿ÄÚÈÝ
ÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨ÔÚt1=0ʱµÄ²¨ÐÎÈçͼËùʾ£¬´Ëʱ²¨´«²¥µ½x=2m´¦µÄÖʵãB£¬ÖʵãAÇ¡ºÃλÓÚ²¨¹ÈλÖã¬C¡¢DÁ½¸öÖʵãµÄƽºâλÖ÷ֱðλÓÚx=3mºÍx=5m´¦£®µ±t2=0.6sʱ£¬ÖʵãAÇ¡ºÃµÚ¶þ´Î£¨´Ó¼ÆʱºóËãÆ𣩴¦ÓÚ²¨·åλÖã¬ÔòÏÂÁÐÅжÏÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢¸Ã²¨µÄ²¨ËÙµÈÓÚ10m/s | B¡¢µ±t=1.0sʱ£¬ÖʵãCÔÚƽºâλÖô¦ÇÒÏòÏÂÔ˶¯ | C¡¢µ±t=0.9sʱ£¬ÖʵãDµÄλÒÆΪ2cm | D¡¢µ±ÖʵãDµÚÒ»´ÎλÓÚ²¨·åλÖÃʱ£¬ÖʵãBÇ¡ºÃλÓÚ²¨¹ÈλÖà |
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
Ò»Áмòгºá²¨£¬ÔÚt=0.6sʱ¿ÌµÄͼÏóÈçͼ¼×Ëùʾ£¬´Ëʱ£¬P¡¢QÁ½ÖʵãµÄλÒƾùΪ-1cm£¬²¨ÉÏAÖʵãµÄÕñ¶¯Í¼ÏóÈçͼÒÒËùʾ£¬ÔòÒÔÏÂ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢ÕâÁв¨ÑØxÖáÕý·½Ïò´«²¥ | ||
B¡¢ÕâÁв¨µÄ²¨ËÙÊÇ
| ||
C¡¢´Ót=0.6s¿ªÊ¼£¬½ô½Ó×ŵġ÷t=0.6sʱ¼äÄÚ£¬AÖʵãͨ¹ýµÄ·³ÌÊÇ10m | ||
D¡¢´Ót=0.6s¿ªÊ¼£¬ÖʵãP±ÈÖʵãQÔç0.4s»Øµ½Æ½ºâλÖà | ||
E¡¢Èô¸Ã²¨ÔÚ´«²¥¹ý³ÌÖÐÓöµ½Ò»¸ö³ß´çΪ30mµÄÕÏ°Î²»ÄÜ·¢ÉúÃ÷ÏÔÑÜÉäÏÖÏó |
ÈçͼËùʾ£¬Á½Áмòгºá²¨·Ö±ðÑØxÖáÕý·½ÏòºÍ¸º·½Ïò´«²¥£¬Á½²¨Ô´·Ö±ðλÓÚx=-0.2mºÍx=1.2m´¦£¬Á½Áв¨µÄËٶȾùΪv=0.4m/s£¬Á½²¨Ô´µÄÕñ·ù¾ùΪA=2cm£®Í¼Ê¾Îªt=0ʱ¿ÌÁ½Áв¨µÄͼÏ󣨴«²¥·½ÏòÈçͼËùʾ£©£¬´Ë¿ÌƽºâλÖô¦ÓÚx=0.2mºÍx=0.8mµÄP¡¢QÁ½Öʵã¸Õ¿ªÊ¼Õñ¶¯£®ÖʵãMµÄƽºâλÖô¦ÓÚx=0.5m´¦£¬¹ØÓÚ¸÷ÖʵãÔ˶¯Çé¿öÅжÏÕýÈ·µÄÊÇ £¨¡¡¡¡£©
A¡¢Á½Áв¨ÏàÓöºóÕñ·ùÈÔȻΪ2cm | B¡¢t=1 sʱ¿Ì£¬ÖʵãMµÄλÒÆΪ-4 cm | C¡¢t=1 sʱ¿Ì£¬ÖʵãMµÄλÒÆΪ+4 cm | D¡¢t=0.75 sʱ¿Ì£¬ÖʵãP¡¢Q¶¼Ô˶¯µ½Mµã | E¡¢ÖʵãP¡¢QµÄÆðÕñ·½Ïò¶¼ÑØyÖḺ·½Ïò |
Ò»Áмòгºá²¨ÑØxÖáÕý·½Ïò´«²¥£¬t=0ʱ¿Ì²¨Ç¡´«µ½x=6m´¦µÄPÖʵ㣬´Ëʱ²¨µÄͼÏóÈçͼËùʾ£¬Ö®ºóÔÚt=1sʱ¿Ì£¬x=10m´¦µÄÖʵãQµÚÒ»´Î¾Æ½ºâλÖÃÏòÉÏÔ˶¯£¬Ôò£¨¡¡¡¡£©
A¡¢t=0ʱ¿Ì£¬PÖʵãÕñ¶¯·½ÏòÑØ+y·½Ïò | B¡¢t=1sʱ¿Ì£¬PÖʵãµÄ¼ÓËÙ¶È×î´ó | C¡¢¸Ã²¨µÄ²¨ËÙΪ8m/s | D¡¢´Ót=0µ½t=0.25s£¬ÖʵãEÑØx·½ÏòµÄλÒÆΪ1m |
ÉþµÄÒ»¶ËÓë¹ÌÓÐƵÂÊΪ25HzµÄÕñ¶¯»ÉƬÏàÁ¬£¬»ÉƬ×ÔÓÉÕñ¶¯£®ÈçͼΪijһʱ¿ÌÉþÐγɵIJ¨ÐÎͼ£¬ÒÑÖªP¡¢QÁ½µãÏà¾à15cm£¬ÔòÒÔÏÂ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢PµãµÄÕñ¶¯ÖÜÆÚΪ25s | B¡¢´ËʱQµãµÄÕñ¶¯·½ÏòÏòÏ | C¡¢ÔÙ¾¹ý0.06s£¬ÖʵãPÒƵ½QµãµÄλÖà | D¡¢Èô¸ÄÓÃ10HzµÄÕñ¶¯»ÉƬ£¬²¨µÄ´«²¥ËٶȲ»±ä |
Ò»¼òг»úе²¨ÑØxÖáÕý·½Ïò´«²¥£¬²¨³¤Îª¦Ë£¬ÖÜÆÚΪT£®ÔÚt=
ʱ¿ÌµÄ²¨ÐÎͼÈçͼ¼×Ëùʾ£¬a¡¢bÊDz¨ÉϵÄÁ½¸öÖʵ㣮ͼÒÒ±íʾ½éÖÊÖÐijһÖʵãµÄÕñ¶¯Í¼Ïó£®ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
T |
2 |
A¡¢Í¼ÒÒÊÇÖʵãaµÄÕñ¶¯Í¼Ïó |
B¡¢Í¼ÒÒÊÇÖʵãbµÄÕñ¶¯Í¼Ïó |
C¡¢t=0ʱ¿ÌÖʵãaµÄ¼ÓËٶȱÈÖʵãbµÄ´ó |
D¡¢t=0ʱ¿ÌÖʵãaµÄËٶȱÈÖʵãbµÄ´ó |
ÈçͼÖÐÊÇÒ»ÁÐÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨ÔÚt=0ʱ¿ÌµÄ²¨ÐÎͼ£¬´ËʱÖʵãBÔ˶¯µ½²¨·å£¬ÖʵãCÇ¡ºÃͨ¹ýƽºâλÖ㮸ò¨µÄÖÜÆÚΪ4.0s£¬¹ØÓÚÖʵãBºÍCÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢ËüÃÇ¿ªÊ¼Õñ¶¯Ê±µÄÔ˶¯·½ÏòÏàͬ | B¡¢´Ë¿ÌÒÔºóµÄ1sÄÚCÖʵãµÄ¼ÓËٶȷ½ÏòÒ»Ö±ÑØyÖáÕý·½Ïò | C¡¢ÔÚ¿ªÊ¼Õñ¶¯ºóµÄÈκÎÁ¬ÐøµÄ2sÄÚ£¬ºÏÍâÁ¦¶ÔËüÃÇ×öµÄ¹¦¶¼ÎªÁã | D¡¢ËüÃÇÕñ¶¯¹ý³ÌÖеÄÈÎÒâ1sÄÚͨ¹ýµÄ·³Ì¾ùΪ2.0cm |
ÈçͼËùʾ£¬Ò»ÁÐÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨£¬Õñ·ùΪ2cm£¬²¨ËÙΪ2m/s£¬a¡¢bÁ½ÖʵãµÄƽºâλÖÃÏà¾à0.4m£¬ÇÒ´óÓÚ°ë¸ö²¨³¤Ð¡ÓÚÒ»¸ö²¨³¤£®µ±Öʵãa´¦ÓÚ²¨·åλÖÃʱ£¬ÖʵãbÏà¾àxÖá1cm£®Ôò£¨¡¡¡¡£©
A¡¢´Ë²¨µÄÖÜÆÚ¿ÉÄÜΪ0.3s | B¡¢´Ë²¨µÄ²¨³¤¿ÉÄÜΪ0.48m | C¡¢´Ó´Ëʱ¿ÌÆð¾¹ý0.5s£¬bµã¿ÉÄÜÔÚ²¨¹ÈλÖà | D¡¢´Ó´Ëʱ¿ÌÆð¾¹ý0.5s£¬bµã¿ÉÄÜÔÚ²¨·åλÖà |