¾«Ó¢¼Ò½ÌÍøÈçͼΪһˮƽ´«ËÍ´ø×°ÖÃʾÒâͼ£®½ô±ÁµÄ´«ËÍ´øABʼÖÕ±£³Öºã¶¨µÄËÙÂÊv=1m/sÔËÐУ¬Ò»ÖÊÁ¿Îªm=4kgµÄú¿éÎÞ³õËٶȵطÅÔÚA´¦£¬´«ËÍ´ø¶Ôú¿éµÄ»¬¶¯Ä¦²ÁÁ¦Ê¹Ãº¿é¿ªÊ¼×öÔȼÓËÙÖ±ÏßÔ˶¯£¬Ëæºóú¿éÓÖÒÔÓë´«ËÍ´øÏàµÈµÄËÙÂÊ×öÔÈËÙÖ±ÏßÔ˶¯£®Éèú¿éÓë´«ËÍ´øÖ®¼äµÄ¶¯Ä¦²ÁÒòÊý¦Ì=0.1£¬A¡¢B¼äµÄ¾àÀëL=2m£¬gÈ¡10m/s2£®
£¨1£©Çóú¿é¸Õ¿ªÊ¼Ô˶¯Ê±¼ÓËٶȵĴóС£»
£¨2£©Çóú¿é´«Ë͵½BµãµÄʱ¼äºÍƤ´øÉÏÁôϵÄú¿é»®ºÛ³¤¶È£®
£¨3£©Èç¹ûÌá¸ß´«ËÍ´øµÄÔËÐÐËÙÂÊ£¬Ãº¿é¾ÍÄܱ»½Ï¿ìµØ´«Ë͵½B´¦£¬Çóú¿é´ÓA´¦´«Ë͵½B´¦µÄ×î¶Ìʱ¼äºÍ´«ËÍ´ø¶ÔÓ¦µÄ×îСÔËÐÐËÙÂÊ£®
·ÖÎö£º£¨1£©Ê×ÏÈ·ÖÎöú¿é·ÅÉÏ´«ËÍ´øºóµÄÊÜÁ¦Çé¿ö£¬ÓÃÅ£¶ÙµÚ¶þ¶¨ÂÉÇó³ö¼ÓËٶȣ»
£¨2£©½áºÏÔ˶¯Ñ§¹«Ê½Çó³öÔȼÓËÙÔ˶¯¹ý³Ìú¿éµÄλÒƺʹ«Ë͵ÄλÒÆ£¬¶þÕßλÒƲîΪƤ´øÉÏú¿éÁôÏ»®ºÛµÄ³¤¶È£®
£¨3£©ÒªÊ¹´«Ë͵Äʱ¼ä×î¶Ì£¬¿É֪ú¿éӦʼÖÕ×öÔȼÓËÙÔËÐУ¬ËùÒÔµ±Ãº¿éµ½´ïÓҶ˸պõÈÓÚ´«ËÍ´øËÙ¶Èʱ£¬´«ËÍ´øËÙ¶È×îС£®
½â´ð£º½â£º£¨1£©ÓÉÅ£¶ÙµÚ¶þ¶¨ÂɵÃú¿é×öÔȼÓËÙÔ˶¯µÄ¼ÓËÙ¶ÈΪ£º
a=
¦Ìmg
m
=1m/s2
£¨2£©Óɹ«Ê½v2=2axµÃú¿é×öÔȼÓËÙÖ±ÏßÔ˶¯µÄλÒÆΪ£º
x=
v2
2a
=
12
2¡Á1
=0.5m£¼2m
ËùÒÔú¿éÏȼÓËÙºóÔÈËÙÔ˶¯£¬¼ÓËÙʱ¼ä£ºt1=
v
a
=
1
1
=1s£¬
ÔÈËÙʱ¼ä£ºt2=
L-x
v
=
2-0.5
1
=1.5s
ú¿é´«Ë͵½BµãµÄʱ¼ä£ºt=t1+t2=1s+1.5s=2.5s
ú¿éÔȼÓËÙʱ¼äÄÚ´«ËÍ´øµÄλÒÆΪ£ºx¡ä=vt1=1¡Á1=1m
ÔòƤ´øÉÏÁôϵÄú¿é»®ºÛ³¤¶ÈΪ£º¡÷x=x¡ä-x=1-0.5=0.5m£»
£¨3£©ÒªÊ¹´«Ë͵Äʱ¼ä×î¶Ì£¬¿É֪ú¿éӦʼÖÕ×öÔȼÓËÙÔËÐУ¬ËùÒÔµ±Ãº¿éµ½´ïÓҶ˸պõÈÓÚ´«ËÍ´øËÙ¶Èʱ£¬´«ËÍ´øËÙ¶È×îС£®Éè´«ËÍ´øµÄ×îСÔËÐÐËÙÂÊΪvmin£¬ÔòÓУºvmin2=2aL
Òò¼ÓËÙ¶ÈÈÔΪ£ºa=lm/s2£¬
ËùÒÔ×îСÔËÐÐËÙÂÊΪ£ºvmin=
2aL
=
2¡Á1¡Á2
=2m/s
ÐÐÀî×î¶ÌÔËÐÐʱ¼äΪ£ºtmin=
vmin
a
=
2
1
=2s£»
´ð£º£¨1£©Ãº¿é¸Õ¿ªÊ¼Ô˶¯Ê±¼ÓËٶȵĴóС1m/s2£»
£¨2£©Ãº¿é´«Ë͵½BµãµÄʱ¼ä2.5s£¬Æ¤´øÉÏÁôϵÄú¿é»®ºÛ³¤¶È0.5m£®
£¨3£©Èç¹ûÌá¸ß´«ËÍ´øµÄÔËÐÐËÙÂÊ£¬Ãº¿é¾ÍÄܱ»½Ï¿ìµØ´«Ë͵½B´¦£¬Ãº¿é´ÓA´¦´«Ë͵½B´¦µÄ×î¶Ìʱ¼ä2s£¬´«ËÍ´ø¶ÔÓ¦µÄ×îСÔËÐÐËÙÂÊ2m/s£®
µãÆÀ£º¸ÃÌ⿼²éÊǵĴ«ËÍ´øÎÊÌ⣬½â¾ö±¾ÌâµÄ¹Ø¼ü»á¸ù¾ÝÊÜÁ¦ÅжÏÐÐÀîµÄÔ˶¯Çé¿ö£¬ÐÐÀîÔÚ´«ËÍ´øÉÏÏȼÓËÙÔ˶¯£¬È»ºóÔٺʹ«ËÍ´øÒ»ÆðÔÈËÙÔ˶¯£¬ÈôҪʱ¼ä×î¶Ì£¬ÔòÐÐÀîÒ»Ö±×öÔȼÓËÙÔ˶¯£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÈçͼËùʾ£¬ÓÃˮƽ´«ËÍ´øÏò³µÏáװú£¬´«ËÍ´ø³¤L=4.5m£¬ËÙ¶ÈΪv0=3.5m/s£®Ãº¶·Ë͵½´«ËÍ´ø×ó¶ËµÄúΪÿÃëÖÓm0=2.0kg£¬ÃºÂäµ½´«ËÍ´øÉÏʱËٶȺöÂÔ²»¼Æ£¬¶¯Ä¦²ÁÒòÊýΪ¦Ì=0.10£¬ÒÑ֪úÔÚ´«ËÍ´øËÙ¶ÈʼÖÕСÓÚv0£¬Õû¸ö×°Öó¤Ê±¼äÁ¬Ðø¹¤×÷£®£¨g=10m/s2£¬½á¹û±£Áô2λÓÐЧÊý×Ö£©
£¨1£©´«ËÍ´øÉÏ×ÜÊÇÓжàÉÙǧ¿Ëú£¿
£¨2£©Ä³Ê±¿Ì¿ªÊ¼¼Æʱ£¬ÔÚÒ»·ÖÖÓʱ¼äÄÚ´«ËÍ´ø¶Ôú×ö¶àÉÙ¹¦£¿
£¨3£©´«ËÍ´øÓɵ綯»ú´ø¶¯£¬²»¼ÆתÖáµÄĦ²Á£¬Çóµç¶¯»úµÄÊä³ö¹¦ÂÊ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

¾«Ó¢¼Ò½ÌÍøÈçͼËùʾΪij¹¤³§×°ÔØ»õÎïµÄÔ­ÀíʾÒâͼ£¬Éè´«ËÍAB µÄ³¤¶ÈΪ8m£¬»õÎïÓë´«ËÍ´øµÄ¶¯Ä¦²ÁÁ¦ÒòÊýΪ0.6£¬»õÎïÒÔ³õËÙ¶È10m/s»¬ÖÁ´«ËÍ´øµÄA ¶Ë£¬³µÏ᳤Ϊ12m£¬³µÏáµÄ¶¥²¿µ½B ¶¥¶ËµÄ¸ß¶È²îΪ1.25m£¬Í¨¹ýµ÷½Ú´«ËÍ´ø£¨Ë²Ê±Õ룩µÄËٶȿɺÏÀíµØ½«³µÏá×°ÂúÒÔʵÏÖ×Ô¶¯×°»õ£¬ÔòÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨¡¡¡¡£©
A¡¢³µÏáµ½B µÄˮƽ¾àÀëÖÁÉÙ1m Ê±£¬»õÎï²ÅÄÜ×°½ø³µÏáB¡¢Èô´«ËÍ´øÄæʱÕëת¶¯Ê±£¬»õÎï²»¿ÉÄÜ×°½ø³µÏáC¡¢Ö»Òª´«´øµÄËÙ¶È×ã¹»´ó£¬»õÎï¾Í¿Éµ½´ï³µÏáµÄÓÒ¶ËD¡¢ÈôÒª»õÎï´ïµ½³µÏáµÄÓҶˣ¬Ë¾»úÐèÒª°Ñ³µÏò×óÒƶ¯Ò»¶Î¾àÀë

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£ºÑ§Ï°Öܱ¨¡¡ÎïÀí¡¡È˽̿αê¸ßÒ»°æ(±ØÐÞ1)¡¡2009£­2010ѧÄê¡¡µÚ19£­26ÆÚ¡¡×ܵÚ175£­182ÆÚ È˽̿αê°æ(±ØÐÞ1) ÌâÐÍ£º038

ËÄ´¨ãë´¨5.12´óµØÕðÇ£¶¯ÒÚÍò¹úÈ˵ÄÐÄ£¬¸÷ÖÖ¾ÈÔÖÎï×ʲ»¶Ïͨ¹ý»ú³¡ºÍ»ð³µÕ¾ÔËË͵½ÔÖÇø£¬Èçͼ1Ëùʾ£¬Ë®Æ½´«ËÍ´øÔÚ×°Ë;ÈÔÖÎï×Ê·½Ãæ·¢»Óמ޴óµÄ×÷Óã®Èçͼ2ËùʾΪһˮƽ´«ËÍ´ø×°ÖÃʾÒâͼ£¬±Á½ôµÄ´«ËÍ´øABʼÖÕ±£³Öv£½1 m/sµÄºã¶¨ËÙÂÊÔËÐУ¬Ò»ÖÊÁ¿Îªm£½4 kgµÄ¾ÈÔÖÎïÖÊÒÔ³õËÙ¶ÈΪÁã·ÅÔÚA´¦£¬´«ËÍ´ø¶Ô¾ÈÔÖÎï×ʵÄĦ²ÁÁ¦Ê¹¾ÈÔÖÎï×Ê×öÔȼÓËÙÖ±ÏßÔ˶¯£¬Ëæºó¾ÈÔÖÎï×ÊÓÖÒÔÓë´«ËÍ´øÏàµÈµÄËÙÂÊÔ˶¯£¬Éè¾ÈÔÖÎï×ÊÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòËئ̣½0.1£¬AB¼ä¾àÀël£½2 m£¬gÈ¡10 m/s2£®

(1)Çó¾ÈÔÖÎï×ʸտªÊ¼Ô˶¯Ê±ËùÊܵĻ¬¶¯Ä¦²ÁÁ¦´óСÓë¼ÓËٶȴóС£»

(2)Çó¾ÈÔÖÎï×Ê×öÔȼÓËÙÖ±ÏßÔ˶¯µÄʱ¼ä£»

(3)Èç¹ûÌá¸ß´«ËÍ´øµÄÔËÐÐËÙÂÊ£¬¾ÈÔÖÎï×ʾÍÄܱ»½Ï¿ì´«Ë͵½B´¦£¬Çó¾ÈÔÖÎï×Ê´ÓA´¦´«Ë͵½B´¦µÄ×î¶Ìʱ¼äºÍ´«ËÍ´ø¶ÔÓ¦µÄ×îСÔËÐÐËÙÂÊ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

Èçͼ8ËùʾΪij¹¤³§×°ÔØ»õÎïµÄÔ­ÀíʾÒâͼ£¬Éè´«ËÍABµÄ³¤¶ÈΪ8m£¬»õÎïÓë´«ËÍ´øµÄ¶¯Ä¦²ÁÁ¦ÒòÊýΪ0.6£¬»õÎïÒÔ³õËÙ¶È10m/s»¬ÖÁ´«ËÍ´øµÄA¶Ë£¬³µÏ᳤Ϊ12m£¬³µÏáµÄ¶¥²¿µ½B¶¥¶ËµÄ¸ß¶È²îΪ1.25m£¬Í¨¹ýµ÷½Ú´«ËÍ´ø£¨Ë²Ê±Õ룩µÄËٶȿɺÏÀíµØ½«³µÏá×°ÂúÒÔʵÏÖ×Ô¶¯×°»õ£¬ÔòÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨       £©

A£®³µÏáµ½BµÄˮƽ¾àÀëÖÁÉÙ1mʱ£¬»õÎï²ÅÄÜ×°½ø³µÏá

B£®Èô´«ËÍ´øÄæʱÕëת¶¯Ê±£¬»õÎï²»¿ÉÄÜ×°½ø³µÏá

C£®Ö»Òª´«´øµÄËÙ¶È×ã¹»´ó£¬»õÎï¾Í¿Éµ½´ï³µÏáµÄÓÒ¶Ë

D£®ÈôÒª»õÎï´ïµ½³µÏáµÄÓҶˣ¬Ë¾»úÐèÒª°Ñ³µÏò×óÒƶ¯Ò»¶Î¾àÀë

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2007-2008ѧÄêºÚÁú½­Ê¡¹þ¶û±õÎåÖиßÈý£¨ÉÏ£©Ô¿¼ÎïÀíÊÔ¾í£¨12Ô·ݣ©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

ÈçͼËùʾ£¬ÓÃˮƽ´«ËÍ´øÏò³µÏáװú£¬´«ËÍ´ø³¤L=4.5m£¬ËÙ¶ÈΪv=3.5m/s£®Ãº¶·Ë͵½´«ËÍ´ø×ó¶ËµÄúΪÿÃëÖÓm=2.0kg£¬ÃºÂäµ½´«ËÍ´øÉÏʱËٶȺöÂÔ²»¼Æ£¬¶¯Ä¦²ÁÒòÊýΪ¦Ì=0.10£¬ÒÑ֪úÔÚ´«ËÍ´øËÙ¶ÈʼÖÕСÓÚv£¬Õû¸ö×°Öó¤Ê±¼äÁ¬Ðø¹¤×÷£®£¨g=10m/s2£¬½á¹û±£Áô2λÓÐЧÊý×Ö£©
£¨1£©´«ËÍ´øÉÏ×ÜÊÇÓжàÉÙǧ¿Ëú£¿
£¨2£©Ä³Ê±¿Ì¿ªÊ¼¼Æʱ£¬ÔÚÒ»·ÖÖÓʱ¼äÄÚ´«ËÍ´ø¶Ôú×ö¶àÉÙ¹¦£¿
£¨3£©´«ËÍ´øÓɵ綯»ú´ø¶¯£¬²»¼ÆתÖáµÄĦ²Á£¬Çóµç¶¯»úµÄÊä³ö¹¦ÂÊ£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸