´«ËÍ´øÓëˮƽ·½ÏòµÄ¼Ð½ÇΪ¦Á£¬ÈçͼËùʾ£¬½«ÖÊÁ¿ÎªmµÄÎïÌå·ÅÔÚ´«ËÍ´øÉÏ£¬Ëæ´«ËÍ´øÒ»ÆðÏòÏÂÒÔ¼ÓËÙ¶ÈaÔȼÓËÙÖ±ÏßÔ˶¯£¬Ôò


  1. A.
    СÎïÌåÊܵ½µÄÖ§³ÖÁ¦Ó뾲Ħ²ÁÁ¦µÄºÏÁ¦µÈÓÚmg
  2. B.
    СÎïÌåÊܵ½µÄ¾²Ä¦²ÁÁ¦µÄ·½ÏòÒ»¶¨ÑØ´«ËÍ´øÏòÏ£¬´óСÊÇma
  3. C.
    СÎï¿éÊܵ½µÄ¾²Ä¦²ÁÁ¦µÄ´óС¿ÉÄܵÈÓÚmgsin¦Á
  4. D.
    СÎï¿éÊܵ½µÄÖØÁ¦ºÍ¾²Ä¦²ÁÁ¦µÄºÏÁ¦µÄ·½ÏòÒ»¶¨ÑØƤ´ø·½ÏòÏòÏÂ
C
·ÖÎö£ºÖÊÁ¿ÎªmµÄÎïÌå·ÅÔÚƤ´ø´«ËÍ»úÉÏ£¬ËæƤ´øÒ»ÆðÒÔÏòϼÓËÙ¶È×öÔȼÓËÙÖ±ÏßÔ˶¯£¬ÊÜÖØÁ¦¡¢Ö§³ÖÁ¦ºÍ¾²Ä¦²ÁÁ¦×÷ÓÃÏÂÔ˶¯£¬¸ù¾ÝÅ£¶ÙµÚ¶þ¶¨ÂÉÁз½³ÌÌÖÂÛ½â¾ö
½â´ð£ºA¡¢ÓÉÌâÒâ¿ÉÖª£¬ÎïÌåËæ´«ËÍ´øÒ»ÆðÏòÏÂÒÔ¼ÓËÙ¶ÈaÔȼÓËÙÖ±ÏßÔ˶¯£¬¸ù¾ÝÊÜÁ¦·ÖÎöÓëÅ£¶ÙµÚ¶þ¶¨ÂÉ¿ÉÖª£¬µ±´«ËÍ´øÓëˮƽ·½ÏòµÄ¼Ð½ÇΪ45¡ãʱ£¬Ð¡ÎïÌåÊܵ½µÄÖ§³ÖÁ¦Ó뾲Ħ²ÁÁ¦µÄºÏÁ¦²ÅµÈÓÚmg£¬ÕýºÃÎïÌåÊܵ½µÄºÏÁ¦·½ÏòÑØ×Å´«ËÍ´ø·½Ïò£¬´Ó¶ø¼ÓËÙÖ±ÏßÔ˶¯£¬¹ÊA´íÎó£»
B¡¢¸ù¾ÝÎïÌå¼ÓËٶȴóС£¬ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÁз½³ÌµÃ£ºmgsin¦Á+f=ma£¬¹Ê¾²Ä¦²ÁÁ¦µÄ´óС²»ÊÇma£¬¹ÊB´íÎó
C¡¢ÓÉÅ£¶ÙµÚ¶þ¶¨ÂÉÁз½³ÌµÃ£ºmgsin¦Á+f=ma£¬µ±a=2gsin¦Áʱ£¬Ôò¾²Ä¦²ÁÁ¦µÄ´óС¿ÉÄܵÈÓÚmgsin¦Á£¬ËùÒÔCÕýÈ·
D¡¢ÎïÌåÊÜÖØÁ¦¡¢Ö§³ÖÁ¦ºÍ¾²Ä¦²ÁÁ¦×÷Óã¬ÈýÁ¦ºÏÁ¦ÑØ´«ËÍ´øƽÃæÏòÏ£¬¶øµ¯Á¦±ØÓë´ËƽÃæ´¹Ö±£¬Ð¡Îï¿éÊܵ½µÄÖØÁ¦ºÍĦ²ÁÁ¦µÄºÏÁ¦µÄ·½ÏòÒ»¶¨²»ÑØбÃæ·½Ïò£¬¹ÊD´íÎó
¹ÊÑ¡C
µãÆÀ£º½â¾ö±¾ÌâµÄ¹Ø¼üÄܹ»ÕýÈ·µØ½øÐÐÊÜÁ¦·ÖÎö£¬×¥×¡ÎïÌåµÄ¼ÓËÙ¶ÈÓë´«ËÍ´øÏàͬ£¬ÔËÓÃÅ£¶ÙµÚ¶þ¶¨ÂɽøÐÐÇó½â£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÈçͼËùʾ£¬¿É¿´³ÉÖʵãÖÊÁ¿·Ö±ðΪm1=1kgµÄÎïÌåAºÍm2=2kgµÄÎïÌåBÖ®¼ä¼Ð×ÅһѹËõµÄÇá¡¢¶Ìµ¯»É£¬Á½ÎïÌåÓÃϸÏß°ó×Å·ÅÔÚˮƽ´«ËÍ´øÉÏ£¬ÎïÌåÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.2£¬´«ËÍ´øÁ½¶ËÓë¹â»¬Ë®Æ½µØÃæÏàÇУ®Ä³Ò»Ê±¿ÌÉÕ¶ÏϸÏߣ¬Í¬Ê±´«ËÍ´øÒÔv=3m/sµÄºã¶¨ËÙ¶ÈÑØ˳ʱÕë·½ÏòÔ˶¯£¨ºöÂÔ´«ËÍ´ø¼ÓËٺ͵¯»Éµ¯¿ªµÄʱ¼ä£©£®µ¯¿ªÊ±£¬A»ñµÃµÄËÙ¶ÈΪvA=4m/s£¬A¡¢B¾à´«ËÍ´øÁ½¶ËµÄ¾àÀëÈçͼËùʾ£¬£¨È¡g=10m/s2£©Çó£º

£¨1£©µ¯¿ª¹ý³Ìµ¯»ÉÊͷŵĵ¯ÐÔÊÆÄÜ£®
£¨2£©A¡¢Bµ½´ï´«ËÍ´øÁ½¶ËʱµÄËٶȴóС£®
£¨3£©ÈôÔÚ´«ËÍ´øÁ½¶ËÍâµÄˮƽµØÃæÉϸ÷¹Ì¶¨·ÅÖÃÒ»°ë¾¶ÏàͬµÄ¹â»¬ÊúÖ±Ô²¹ìµÀ£¬ÒªÊ¹Á½ÎïÌåµÚÒ»´Î³åÉÏÄÚÔ²¹ìµÀºó¶¼²»ÍÑÀë¹ìµÀ£¬¹ìµÀ°ë¾¶Ó¦Âú×ãʲôÌõ¼þ£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

¾«Ó¢¼Ò½ÌÍøÈçͼËùʾ£¬´«ËÍ´øÓëˮƽ·½Ïò¼Ð37¡ã½Ç£¬ÔÚƤ´øÂÖ´ø¶¯Ï´«ËÍ´øÒԺ㶨ËÙ¶È
v=2m/sËÙ¶ÈÑØÄæʱÕë·½Ïòת¶¯£®¿ÉÊÓΪÖʵãµÄСÎï¿éÎÞ³õËٵطÅÔÚ´«ËÍ´øAµã£¬Îï¿éÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊýΪ0.5£¬Á½Æ¤´øÂÖÖ®¼äµÄ¾àÀëL=3.2m£®£¬ÒÑÖªsin37¡ã=0.6£¬gÈ¡10m/s2£¬Çó
£¨1£©Ð¡Îï¿éÔÚ´«ËÍ´øÉÏÔ˶¯Ê±¼ä£»
£¨2£©Ð¡Îï¿éÔÚƤ´øÉÏ»¬¹ýºó»áÁôϺۼ£µÄ³¤¶È£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÈçͼËùʾ,¿É¿´³ÉÖʵãÖÊÁ¿·Ö±ðΪm1=1kgµÄÎïÌåAºÍm2=2kgµÄÎïÌåBÖ®¼ä¼Ð×ÅһѹËõµÄÇá¡¢¶Ìµ¯»É£¬Á½ÎïÌåÓÃϸÏß°ó×Å·ÅÔÚˮƽ´«ËÍ´øÉÏ£¬ÎïÌåÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.2£¬´«ËÍ´øÁ½¶ËÓë¹â»¬Ë®Æ½µØÃæÏàÇС£Ä³Ò»Ê±¿ÌÉÕ¶ÏϸÏߣ¬Í¬Ê±´«ËÍ´øÒԵĺ㶨ËÙ¶ÈÑØ˳ʱÕë·½ÏòÔ˶¯£¨ºöÂÔ´«ËÍ´ø¼ÓËٺ͵¯»Éµ¯¿ªµÄʱ¼ä£©¡£µ¯¿ªÊ±£¬A»ñµÃµÄËÙ¶ÈΪ£¬A¡¢B¾à´«ËÍ´øÁ½¶ËµÄ¾àÀëÈçͼËùʾ£¬£¨È¡£©Ç󣺡£

(1)µ¯¿ª¹ý³Ìµ¯»ÉÊͷŵĵ¯ÐÔÊÆÄÜ¡£

(2)A¡¢Bµ½´ï´«ËÍ´øÁ½¶ËʱµÄËٶȴóС¡£

(3)ÈôÔÚ´«ËÍ´øÁ½¶ËÍâµÄˮƽµØÃæÉϸ÷¹Ì¶¨·ÅÖÃÒ»°ë¾¶ÏàͬµÄ¹â»¬ÊúÖ±Ô²¹ìµÀ£¬ÒªÊ¹Á½ÎïÌåµÚÒ»´Î³åÉÏÄÚÔ²¹ìµÀºó¶¼²»ÍÑÀë¹ìµÀ£¬¹ìµÀ°ë¾¶Ó¦Âú×ãʲôÌõ¼þ£¿

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2012ÄêËÄ´¨Ê¡³É¶¼ÆßÖи߿¼ÎïÀíÄ£ÄâÊÔ¾í£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

ÈçͼËùʾ£¬¿É¿´³ÉÖʵãÖÊÁ¿·Ö±ðΪm1=1kgµÄÎïÌåAºÍm2=2kgµÄÎïÌåBÖ®¼ä¼Ð×ÅһѹËõµÄÇá¡¢¶Ìµ¯»É£¬Á½ÎïÌåÓÃϸÏß°ó×Å·ÅÔÚˮƽ´«ËÍ´øÉÏ£¬ÎïÌåÓë´«ËÍ´ø¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.2£¬´«ËÍ´øÁ½¶ËÓë¹â»¬Ë®Æ½µØÃæÏàÇУ®Ä³Ò»Ê±¿ÌÉÕ¶ÏϸÏߣ¬Í¬Ê±´«ËÍ´øÒÔv=3m/sµÄºã¶¨ËÙ¶ÈÑØ˳ʱÕë·½ÏòÔ˶¯£¨ºöÂÔ´«ËÍ´ø¼ÓËٺ͵¯»Éµ¯¿ªµÄʱ¼ä£©£®µ¯¿ªÊ±£¬A»ñµÃµÄËÙ¶ÈΪvA=4m/s£¬A¡¢B¾à´«ËÍ´øÁ½¶ËµÄ¾àÀëÈçͼËùʾ£¬£¨È¡g=10m/s2£©Çó£º

£¨1£©µ¯¿ª¹ý³Ìµ¯»ÉÊͷŵĵ¯ÐÔÊÆÄÜ£®
£¨2£©A¡¢Bµ½´ï´«ËÍ´øÁ½¶ËʱµÄËٶȴóС£®
£¨3£©ÈôÔÚ´«ËÍ´øÁ½¶ËÍâµÄˮƽµØÃæÉϸ÷¹Ì¶¨·ÅÖÃÒ»°ë¾¶ÏàͬµÄ¹â»¬ÊúÖ±Ô²¹ìµÀ£¬ÒªÊ¹Á½ÎïÌåµÚÒ»´Î³åÉÏÄÚÔ²¹ìµÀºó¶¼²»ÍÑÀë¹ìµÀ£¬¹ìµÀ°ë¾¶Ó¦Âú×ãʲôÌõ¼þ£¿

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸