[ÎïÀíÑ¡ÐÞ3-4Ä£¿é]£¨15·Ö£©

£¨1£©±±¾©Ê±¼ä2011Äê3ÔÂ11ÈÕ13ʱ46·ÖÈÕ±¾ÏĘ́ÒÔ¶«µØÇø·¢ÉúÀïÊÏ9.0¼¶Ç¿ÁÒµØÕð£¬ÕðÔ´Éî¶È24km£¬µØÕðËæºóÒý·¢10m¸ßº£Ð¥£¨Èçͼ¼×£©£¬ÐγÉÇ¿´óµÄ²¨ÀË£¬ÏòÇ°Íƽø£¬½«Ñغ£µØ´øÒ»Ò»ÑÍû£¬²¢ÓÚÃÀ¹úµ±µØʱ¼ä3ÔÂ11ÈÕÁ賿3ʱ×óÓÒ£¬µÖ´ï5700¶à¹«ÀïÒÔÍâµÄÏÄÍþÒÄȺµº£¬Ôì³ÉÖÁÉÙ3ÒÚÃÀÔª²Æ²úËðʧ¡£º£Ð¥ÔÚº£ÑóµÄ´«²¥ËٶȴóԼÿСʱ500µ½600km£¬ÊǵØÕ𲨴«²¥ËٶȵÄ1/25×óÓÒ¡£ÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£º£¨¡¡ £©

A£®º£Ð¥²¨Êǵç´Å²¨

B£®ÃÀ¹úÏÄÍþÒÄ·¢ÉúµÄº£Ð¥ÊÇÈÕ±¾·¢ÉúµÄµØÕ𣬲¢½«¸Ã´¦µÄº£Ë®´«µ½ÁËÃÀ¹úÏÄÍþÒĶøÒýÆðµÄ

C£® ¿ÉÒÔÀûÓõØÕ𲨴«²¥ËÙ¶ÈÓ뺣Х´«²¥ËٶȵIJî±ðÔì³ÉµÄʱ¼ä²î½øÐк£Ð¥Ô¤¾¯

D. ÉèͼÒÒËùʾº£Ð¥²¨ÑØ+xÖá·½Ïò´«²¥£¬Í¼ÖÐaµã¾­1/4 ÖÜÆÚʱ½«µ½´ï10m¸ßµÄ²¨·å´¦

( 2 )ÈçͼËùʾΪֱ½ÇÈýÀâ¾µµÄ½ØÃæͼ£¬Ò»Ìõ¹âÏßƽÐÐÓÚBC ±ßÈëÉ䣬¾­Àâ¾µÕÛÉäºó´ÓAC±ßÉä³ö¡£ÒÑÖª¡ÏA=¦È=60¡ã£¬ ¹âÔÚÕæ¿ÕÖеĴ«²¥ËÙ¶ÈΪc¡£Ç󣺢ٸÃÀâ¾µ²ÄÁϵÄÕÛÉäÂÊ£»¢Ú¹âÔÚÀâ¾µÖеĴ«²¥Ëٶȡ£


[ÎïÀíÑ¡ÐÞ3-4Ä£¿é]£¨15·Ö£©

( 1 ) CD       ( 5·Ö)

( 32)½â£º¢ÙÓÉͼÖм¸ºÎ¹Øϵ¿ÉÖª£º¦Á=30¡ã  £¨2·Ö£©

¸ù¾ÝÕÛÉäÂÊn=  £¨2·Ö£©

µÃ£ºn=  £¨2·Ö£©

¢Ú¸ù¾Ý¹«Ê½n=       £¨2·Ö£©

µÃ£ºv=£¨2·Ö£©

Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÎïÀí-Ñ¡ÐÞ3-4Ä£¿é
£¨1£©Í¼1ËùʾΪһÁÐÑØxÖḺ·½Ïò´«²¥µÄ¼òгºá²¨£¬ÊµÏßΪt=0ʱ¿ÌµÄ²¨ÐÎͼ£¬ÐéÏßΪt=0.6sʱµÄ²¨ÐÎͼ£¬²¨µÄÖÜÆÚT£¾0.6s£¬Ôò
D
D

A£®²¨µÄÖÜÆÚΪ2.4s      
B£®ÔÚt=0.9sʱ£¬PµãÑØyÖáÕý·½ÏòÔ˶¯
C£®¾­¹ý0.4s£¬Pµã¾­¹ýµÄ·³ÌΪ4m
D£®ÔÚt=0.5sʱ£¬Qµãµ½´ï²¨·åλÖÃ
£¨2£©ÔÚÕÛÉäÂÊΪn¡¢ºñ¶ÈΪdµÄ²£Á§Æ½°åÉÏ·½µÄ¿ÕÆøÖÐÓÐÒ»µã¹âÔ´S£¬´ÓS·¢³öµÄ¹âÏßSAÒԽǶȦÈÈëÉäµ½²£Á§°åÉϱíÃ棬¾­¹ý²£Á§°åºó´ÓϱíÃæÉä³ö£¬Èçͼ2Ëùʾ£®ÈôÑش˹âÏß´«²¥µÄ¹â´Ó¹âÔ´µ½²£Á§°åÉϱíÃæµÄ´«²¥Ê±¼äÓëÔÚ²£Á§°åÖеĴ«²¥Ê±¼äÏàµÈ£¬µã¹âÔ´Sµ½²£Á§ÉϱíÃæµÄ´¹Ö±¾àÀëLÓ¦ÊǶàÉÙ£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

[ÎïÀíÑ¡ÐÞ3-4Ä£¿é]
£¨1£©Ò»Áмòгºá²¨ÒÔ10m/sµÄËÙ¶ÈÑØxÖáÕý·½Ïò´«²¥£¬t=0ʱ¿ÌÕâÁв¨µÄ²¨ÐÎÈçͼËùʾ£®ÔòaÖʵãµÄÕñ¶¯Í¼ÏóΪ
D
D
£®

£¨2£©Ò»°ë¾¶ÎªR µÄ1/4ÇòÌå·ÅÖÃÔÚˮƽÃæÉÏ£¬ÇòÌåÓÉÕÛÉäÂÊΪ
3
µÄ͸Ã÷²ÄÁÏÖƳɣ®ÏÖÓÐÒ»ÊøλÓÚÇòÐÄOµÄÊúֱƽÃæ
ÄڵĹâÏߣ¬Æ½ÐÐÓÚ×ÀÃæÉäµ½ÇòÌå±íÃæÉÏ£¬ÕÛÉäÈëÇòÌåºóÔÙ´ÓÊúÖ±±íÃæÉä³ö£¬ÈçͼËùʾ£¬ÒÑÖªÈëÉä¹âÏßÓë×ÀÃæµÄ¾àÀëΪ
3
2
R
£®
Çó³öÉä½Ç¦È£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

¾«Ó¢¼Ò½ÌÍø[ÎïÀíÑ¡ÐÞ3-4Ä£¿é]
ÈçͼËùʾÊÇÒ»Áмòгºá²¨ÔÚt=0ʱµÄ²¨ÐÎͼ£¬Èô²¨µÄ´«²¥ËÙ¶ÈΪ2m/s£¬PµãÏòÉÏÕñ¶¯£¬ÔòÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ
 

A£®²¨ÏòÓÒ´«²¥
B£®ÔÙ¾­¹ý¡÷t=0.4sÖʵãPÏòÓÒÒƶ¯0.8m
C£®ÔÙ¾­¹ý¡÷t=0.4sÖʵãPÈÔÔÚƽºâλÖã¬Ëüͨ¹ýµÄ·³ÌΪ0.2m
D£®ÔÙ¾­¹ýÈÎÒâʱ¼äÖʵãQºÍPµÄÕñ¶¯Çé¿ö×ÜÊÇÏàͬµÄ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

[ÎïÀíÑ¡ÐÞ3-4Ä£¿é]

£¨1£©ÈçͼËùʾÊÇÒ»Áмòгºá²¨ÔÚt=0ʱµÄ²¨ÐÎͼ£¬Èô²¨µÄ´«²¥ËÙ¶ÈΪ2m/s£¬PµãÏòÉÏÕñ¶¯£¬ÔòÏÂÁÐ˵·¨ÖÐÕýÈ·µÄÊÇ£¨   £©

A£®²¨ÏòÓÒ´«²¥

B£®ÔÙ¾­¹ý¡÷t=0.4sÖʵãPÏòÓÒÒƶ¯0.8m

C£®ÔÙ¾­¹ý¡÷t=0.4sÖʵãPÈÔÔÚƽºâλÖã¬Ëüͨ¹ýµÄ·³ÌΪ0.2m

D£®ÔÙ¾­¹ýÈÎÒâʱ¼äÖʵãQºÍPµÄÕñ¶¯Çé¿ö×ÜÊÇÏàͬµÄ

£¨2£©ÈçͼËùʾ£¬AOBΪ°ëÔ²Ðβ£Á§×©½ØÃ棬²£Á§µÄÕÛÉäÂÊΪ£¬ÏÖÓÐÒ»ÊøƽÐйâÏßÒÔ45¡ã½ÇÈëÉäµ½ABÃæÉϺ󣬾­ÕÛÉä´Ó°ëÔ²ÃæÉϵIJ¿·ÖλÖÃÉä³ö¡£ÊÔÇó°ëÔ²ÖùÃæÄܱ»ÕÕÁÁµÄ²¿·ÖÓëÕû¸ö°ëÔ²ÖùÃæµÄÃæ»ýÖ®±È¡£

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

£ÛÎïÀíÑ¡ÐÞ3-4Ä£¿é£Ý

£¨1£©ÈçͼËùʾ£¬ÖʵãOÔÚ´¹Ö±xÖá·½ÏòÉÏ×ö¼òгÕñ¶¯£¬ÐγÉÁËÑØxÖá´«²¥µÄºá²¨¡£ÔÚt=0ʱ¿ÌÖʵãO¿ªÊ¼ÏòÉÏÔ˶¯£¬¾­0.2sµÚÒ»´ÎÐγÉͼʾ²¨ÐΣ¬ÓÉ´ËÅжÏÔÚt=2.5sʱ¿Ì£¬ÖʵãA¡¢BµÄÔ˶¯Çé¿öÊÇ£¨      £©

A£®AµãλÓÚxÖáµÄÏ·½¡£

B£®BµãλÓÚxÖáµÄÉÏ·½¡£

C£®AµãÕýÍùÉÏÔ˶¯¡£

D£®BµãÕýÍùÉÏÔ˶¯¡£

£¨2£©ÈçͼËùʾ£¬Í¸Ã÷½éÖÊÇòµÄ°ë¾¶ÎªR£¬¹âÏßDCƽÐÐÖ±¾¶ABÉäµ½½éÖÊÇòµÄCµã£¬DCÓëABµÄ¾àÀëH=0.8R¡£

¢ÙÊÔÖ¤Ã÷£ºDC¹âÏß½øÈë½éÖÊÇòºó£¬µÚÒ»´Îµ½´ï½éÖÊÇòµÄ½çÃæʱ£¬ÔÚ½çÃæÉϲ»»á·¢ÉúÈ«·´É䣮£¨ÒªÇó×÷ͼ˵Ã÷ÀíÓÉ£©

¢ÚÈôDC¹â½øÈë½éÖÊÇòºó£¬µÚ¶þ´Îµ½´ï½éÖÊÇòµÄ½ç¶øʱ£¬´ÓÇòÄÚÕÛÉä³öµÄ¹âÏßÓëÈëÉä¹âÏßƽÐУ¬Çó½éÖʵÄÕÛÉäÂÊ£®

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸