Èç¼×ͼËùʾ£¬³¤Îª4mµÄˮƽ¹ìµÀABÓëÇã½ÇΪ37¡ãµÄ×ã¹»³¤Ð±ÃæBCÔÚB´¦Á¬½Ó£¬ÓÐÒ»ÖÊÁ¿Îª2kgµÄ»¬¿é£¬´ÓA´¦Óɾ²Ö¹¿ªÊ¼ÊÜˮƽÏòÓÒµÄÁ¦F×÷Óã¬F°´ÒÒͼËùʾ¹æÂɱ仯£¬»¬¿éÓëABºÍBC¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.25£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡l0m/s2£®Çó£º
£¨1£©»¬¿éµÚÒ»´Îµ½´ïB´¦Ê±µÄËٶȴóС£»
£¨2£©²»¼Æ»¬¿éÔÚB´¦µÄËÙÂʱ仯£¬»¬¿éµ½´ïBµãʱ³·È¥Á¦F£¬»¬¿é³åÉÏбÃ棬»¬¿é×îÖÕ¾²Ö¹µÄλÖÃÓëBµãµÄ¾àÀ룮£¨sin37¡ã=0.6£©

¾«Ó¢¼Ò½ÌÍø
£¨1£©ÓÉͼµÃ£º0¡«2m£ºF1=20N¡÷X1=2m£»                     
2¡«3m£ºF2=0£¬¡÷X2=1m£»                                             
3¡«4m£ºF3=10N£¬¡÷X3=1m                                             
AÖÁBÓɶ¯Äܶ¨Àí£ºF1?¡÷X1-F3?¡÷X3-¦Ìmg£¨¡÷X1+¡÷X2+¡÷X3£©=
1
2
mvB2
½âµÃvB=
10
m/s       
£¨2£©ÒòΪmgsin37¡ã£¾¦Ìmgcos37¡ã              
É軬¿éÓÉBµãÉÏ»¬µÄ×î´ó¾àÀëΪL£¬
Óɶ¯Äܶ¨Àí-¦ÌmgLcos37¡ã-mgLin37¡ã=0-
1
2
mvB2
    ½âµÃ£ºL=
5
8
m                                                    
´Ó×î¸ßµã»¬»ØˮƽÃ棬ÉèÍ£Ö¹ÔÚÓëBµãÏà¾àS´¦£¬
mgLin37¡ã-¦ÌmgLcos37¡ã-¦Ìmgs=0-0
 ½âµÃ£ºS=1m£®
´ð£º£¨1£©»¬¿éµÚÒ»´Îµ½´ïB´¦Ê±µÄËٶȴóСΪ
10
m/s£»
£¨2£©»¬¿é³åÉÏбÃ棬»¬¿é×îÖÕ¾²Ö¹µÄλÖÃÓëBµãµÄ¾àÀëΪ1 m£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

£¨2011?Ðì»ãÇøÄ£Ä⣩Èç¼×ͼËùʾ£¬³¤Îª4mµÄˮƽ¹ìµÀABÓëÇã½ÇΪ37¡ãµÄ×ã¹»³¤Ð±ÃæBCÔÚB´¦Á¬½Ó£¬ÓÐÒ»ÖÊÁ¿Îª2kgµÄ»¬¿é£¬´ÓA´¦Óɾ²Ö¹¿ªÊ¼ÊÜˮƽÏòÓÒµÄÁ¦F×÷Óã¬F°´ÒÒͼËùʾ¹æÂɱ仯£¬»¬¿éÓëABºÍBC¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.25£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡l0m/s2£®Çó£º
£¨1£©»¬¿éµÚÒ»´Îµ½´ïB´¦Ê±µÄËٶȴóС£»
£¨2£©²»¼Æ»¬¿éÔÚB´¦µÄËÙÂʱ仯£¬»¬¿éµ½´ïBµãʱ³·È¥Á¦F£¬»¬¿é³åÉÏбÃ棬»¬¿é×îÖÕ¾²Ö¹µÄλÖÃÓëBµãµÄ¾àÀ룮£¨sin37¡ã=0.6£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º½­ËÕÆÚÄ©Ìâ ÌâÐÍ£º¼ÆËãÌâ

Èç¼×ͼËùʾ£¬³¤Îª4mµÄˮƽ¹ìµÀABÓëÇã½ÇΪ37¡ãµÄ×ã¹»³¤Ð±ÃæBCÔÚB´¦Á¬½Ó£¬ÓÐÒ»ÖÊÁ¿Îª2kgµÄ»¬¿é£¬´ÓA´¦Óɾ²Ö¹¿ªÊ¼ÊÜˮƽÏòÓÒµÄÁ¦F×÷Óã¬F°´ÒÒͼËùʾ¹æÂɱ仯£¬»¬¿éÓëABºÍBC¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.25£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡l0m£¯s2¡£Çó£º
£¨1£©»¬¿éµÚÒ»´Îµ½´ïB´¦Ê±µÄËٶȴóС£»
£¨2£©²»¼Æ»¬¿éÔÚB´¦µÄËÙÂʱ仯£¬»¬¿éµ½´ïBµãʱ³·È¥Á¦F£¬»¬¿é³åÉÏбÃ棬»¬¿é×îÖÕ¾²Ö¹µÄλÖÃÓëBµãµÄ¾àÀë¡££¨sin37¡ã=0.6£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2011£­2012ѧÄêÉϺ£ÊÐÐì»ãÇø¸ßÈýµÚ¶þ´Î²âÊÔÎïÀíÊÔ¾í£¨A¾í£©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

Èç¼×ͼËùʾ£¬³¤Îª4mµÄˮƽ¹ìµÀABÓëÇã½ÇΪ37°µÄ×ã¹»³¤Ð±ÃæBCÔÚB´¦Á¬½Ó£¬ÓÐÒ»ÖÊÁ¿Îª2kgµÄ»¬¿é£¬´ÓA´¦Óɾ²Ö¹¿ªÊ¼ÊÜˮƽÏòÓÒµÄÁ¦F×÷Óã¬F°´ÒÒͼËùʾ¹æÂɱ仯£¬»¬¿éÓëABºÍBC¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.25£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡l0m/s2£®Çó£º
£¨1£©»¬¿éµÚÒ»´Îµ½´ïB´¦Ê±µÄËٶȴóС£»
£¨2£©²»¼Æ»¬¿éÔÚB´¦µÄËÙÂʱ仯£¬»¬¿éµ½´ïBµãʱ³·È¥Á¦F£¬»¬¿é³åÉÏбÃ棬»¬¿é×îÖÕ¾²Ö¹µÄλÖÃÓëBµãµÄ¾àÀ룮£¨sin37°=0.6£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2011Äê½­ËÕÊ¡ÎÞÎýÊи߿¼ÎïÀíһģÊÔ¾í£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

Èç¼×ͼËùʾ£¬³¤Îª4mµÄˮƽ¹ìµÀABÓëÇã½ÇΪ37°µÄ×ã¹»³¤Ð±ÃæBCÔÚB´¦Á¬½Ó£¬ÓÐÒ»ÖÊÁ¿Îª2kgµÄ»¬¿é£¬´ÓA´¦Óɾ²Ö¹¿ªÊ¼ÊÜˮƽÏòÓÒµÄÁ¦F×÷Óã¬F°´ÒÒͼËùʾ¹æÂɱ仯£¬»¬¿éÓëABºÍBC¼äµÄ¶¯Ä¦²ÁÒòÊý¾ùΪ0.25£¬ÖØÁ¦¼ÓËÙ¶ÈgÈ¡l0m/s2£®Çó£º
£¨1£©»¬¿éµÚÒ»´Îµ½´ïB´¦Ê±µÄËٶȴóС£»
£¨2£©²»¼Æ»¬¿éÔÚB´¦µÄËÙÂʱ仯£¬»¬¿éµ½´ïBµãʱ³·È¥Á¦F£¬»¬¿é³åÉÏбÃ棬»¬¿é×îÖÕ¾²Ö¹µÄλÖÃÓëBµãµÄ¾àÀ룮£¨sin37°=0.6£©

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸