ÌâÄ¿ÄÚÈÝ
Ò»Áмòгºá²¨ÑØxÖáÕý·½Ïò´«²¥£¬ÔÚtÃëÓ루t+0.2£©ÃëÁ½¸öʱ¿Ì£¬xÖáÉÏ£¨-3m£¬3m£©Çø¼äµÄ²¨ÐÎÍêÈ«Ïàͬ£¬ÈçͼËùʾ£®²¢ÇÒͼÖÐM¡¢NÁ½ÖʵãÔÚtÃëʱλÒƾùΪr=
a£¬ÏÂÁÐ˵·¨Öв»ÕýÈ·µÄÊÇ £¨¡¡¡¡£©
| ||
3 |
A¡¢¸Ã²¨µÄ×î´ó²¨ËÙΪ20m/s |
B¡¢£¨t+0.1£©Ãëʱ¿Ì£¬x=-2m´¦µÄÖʵãλÒÆÒ»¶¨ÊÇa |
C¡¢´ÓtÃëʱ¿ÌÆð£¬x=2m´¦µÄÖʵã±Èx=2.5mµÄÖʵãÏȻص½Æ½ºâλÖà |
D¡¢´ÓtÃëʱ¿ÌÆð£¬ÔÚÖʵãMµÚÒ»´Îµ½´ïƽºâλÖÃʱ£¬ÖʵãNÇ¡ºÃµ½´ï²¨·å |
E¡¢¸ÃÁв¨ÔÚ´«²¥¹ý³ÌÖÐÓöµ½¿í¶ÈΪd=3mµÄÏÁ·ìʱ»á·¢ÉúÃ÷ÏÔµÄÑÜÉäÏÖÏó |
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
Ò»¼òгºá²¨ÔÚt=0ʱ¿ÌµÄ²¨ÐÎͼÈçͼËùʾ£¬´«²¥·½Ïò×Ô×óÏòÓÒ£¬ÒÑÖªt1=0.6sÄ©£¬cµã³öÏÖµÚÈý´Î²¨·å£®Ôò £¨¡¡¡¡£©
A¡¢¸Ã¼òг²¨µÄÖÜÆÚΪ0.24s | B¡¢Öʵãc±ÈbÏȻص½Æ½ºâλÖà | C¡¢ÔÚdµãµÚÒ»´Î³öÏÖ²¨¹ÈµÄʱ¼äΪ0.42s | D¡¢¸Ã¼òг²¨´«²¥µ½dµãËùÐèµÄʱ¼äΪ0.36s | E¡¢dµãµÄÆðÕñ·½ÏòÑØyÖáÏòÉÏ |
A¡¢BÁ½Áмòгºá²¨¾ùÑØxÖáÕýÏò´«²¥£¬Ä³Ê±¿ÌµÄËûÃǵIJ¨ÐηֱðÈçͼ¼×¡¢±ûËùʾ£¬¾¹ýʱ¼ät£¨tСÓÚA²¨µÄÖÜÆÚTA£©£¬ÕâÁ½Áмòгºá²¨µÄ²¨Ðηֱð±äΪͼÒÒ¡¢¶¡Ëùʾ£¬ÔòA¡¢BÁ½Áв¨µÄ²¨ËÙvA¡¢vBÖ®±È¿ÉÄܵÄÊÇ £¨¡¡¡¡£©
A¡¢1£º1 | B¡¢3£º2 | C¡¢3£º1 | D¡¢1£º3 | E¡¢1£º5 |
ͼ1ΪһÁмòгºá²¨ÔÚt=0ʱµÄ²¨ÐÎͼ£¬PÊÇƽºâλÖÃÔÚx=1cm´¦µÄÖÊÔª£¬QÊÇƽºâλÖÃÔÚx=4cm´¦µÄÖÊÔª£®Í¼2ΪÖÊÔªQµÄÕñ¶¯Í¼Ïó£®Ôò£¨¡¡¡¡£©
A¡¢t=0.3sʱ£¬ÖÊÔªQµÄ¼ÓËٶȴﵽÕýÏò×î´ó | B¡¢²¨µÄ´«²¥ËÙ¶ÈΪ20m/s | C¡¢²¨µÄ´«²¥·½ÏòÑØxÖḺ·½Ïò | D¡¢t=0.7sʱ£¬ÖÊÔªPµÄÔ˶¯·½ÏòÑØyÖḺ·½Ïò |
Ò»ÁÐÑØxÖá´«²¥µÄ¼òгºá²¨£¬t=0ʱ¿ÌµÄ²¨ÐÎÈçͼËùʾ£¬´ËʱÖʵãPÇ¡ÔÚ²¨·å£¬ÖʵãQÇ¡ÔÚƽºâλÖÃÇÒÏòÉÏÕñ¶¯£®ÔÙ¹ý0.2s£¬ÖʵãQµÚÒ»´Îµ½´ï²¨·å£¬ÔòÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢²¨ÑØxÖáÕý·½Ïò´«²¥ | ||
B¡¢²¨µÄ´«²¥ËÙ¶ÈΪ30m/s | ||
C¡¢1sÄ©ÖʵãPµÄλÒÆΪÁã | ||
D¡¢ÖÊPµÄÕñ¶¯Î»ÒÆËæʱ¼ä±ä»¯µÄ¹ØϵʽΪx=0.2sin£¨2¦Ðt+
| ||
E¡¢0ÖÁ0.9sʱ¼äÄÚPµãͨ¹ýµÄ·³ÌΪ0.9m |
ÈçͼËùʾΪÁ½Áмòгºá²¨ÔÚͬһÉþÉÏ´«²¥ÔÚt=0ʱ¿ÌµÄ²¨ÐÎͼ£¬ÒÑÖª¼×²¨ÏòÓÒ´«£¬ÒÒ²¨Ïò×ó´«£®ÒÔÏÂ˵·¨ÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢¼×²¨µÄƵÂʱÈÒÒ²¨µÄƵÂÊ´ó | B¡¢Á½Áв¨Í¬Ê±´«µ½×ø±êÔµã | C¡¢ÓÉÓÚÁ½²¨Õñ·ù²»µÈ£¬¹ÊÁ½Áв¨ÏàÓöʱ²»»á·¢Éú¸ÉÉæÏÖÏó | D¡¢x=0.5cm´¦µÄÖʵ㿪ʼÕñ¶¯Ê±µÄ·½ÏòÏò+y·½Ïò |
ÈçͼËùʾ£¬ÔÙxoyƽÃæÄÚÓÐÒ»ÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨£¬²¨ËÙΪ2m/s£¬Õñ·ùΪ2cm£¬ÆµÂÊΪ2.5Hz£®ÔÚt=0ʱ¿Ì£¬×ø±êԵ㴦µÄÖʵãλÓÚÆäƽºâλÖÃÉÏ·½×î´óλÒÆ´¦£¬Ôò¾à×ø±êÔµã¾àÀëΪ0.4mµÄQµã£¨¡¡¡¡£©
A¡¢ÔÚ0.1sʱµÄλÒÆÊÇ2cm | B¡¢ÔÚ0.1sʱµÄËÙ¶È×î´ó | C¡¢ÔÚ0.1sʱµÄÕñ¶¯·½ÏòÑØxÖáÕý·½Ïò | D¡¢ÔÚ0.15sʱµÄÕñ¶¯·½ÏòÑØyÖáÕý·½Ïò |
ÑØxÖáÕý·½Ïò´«²¥µÄ¼òгºá²¨£¬ÔÚt=0ʱ¿ÌµÄ²¨ÐÎÈçͼËùʾ£®ÖʵãPλÓÚx=2cm´¦£¬ÖʵãQλÓÚx=6cm´¦£®ÒÑÖªx=4cm´¦ÒÀ´Î³öÏÖÁ½´Î²¨¹ÈµÄʱ¼ä¼ä¸ôΪ0.4s£¬ÔòÒÔÏÂÅжÏÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢ÕâÁв¨µÄ²¨³¤ÊÇ8cm | B¡¢ÖʵãPºÍQµÄλÒÆÔÚÈκÎʱºò¶¼Ïàͬ | C¡¢ÕâÁв¨µÄ´«²¥ËÙ¶ÈÊÇ20cm/s | D¡¢x=4cm´¦Öʵã×ö¼òгÔ˶¯µÄ±í´ïʽΪy=6sin5¦Ðt£¨cm£© |