ÈçͼËùʾ£¬Îï¿éMºÍmÓÃÒ»²»¿ÉÉ쳤µÄϸÉþͨ¹ý¶¨»¬ÂÖÁ¬½Ó£¬m·ÅÔÚÇã½Ç¦È=30¡ãµÄ¹Ì¶¨¹â»¬Ð±ÃæÉÏ£¬¶ø´©¹ýÊúÖ±¸ËPQµÄÎï¿éM¿ÉÑظËÎÞĦ²ÁµØÏ»¬£¬M=3m=1Kg£¬¿ªÊ¼Ê±£¬½«M̧¸ßµ½Aµã£¬Ê¹Ï¸Éþˮƽ£¬´ËʱOA¶ÎÉþ³¤ÎªL=4.0m£¬ÏÖMÓɾ²Ö¹¿ªÊ¼Ï»¬£¬»Ø´ðÏÂÁÐÎÊÌ⣺
£¨1£©Îï¿émµÄ»úеÄÜÊÇ·ñÊغ㣿ÈôÊغ㣬Çë˵³öÀíÓÉ£»Èô²»Êغ㣬Çë˵³ö»úеÄÜÈçºÎ±ä»¯£¬±ä»¯µÄ´óСÓëʲôÁ¦×ö¹¦ÏàµÈ£¿
£¨2£©µ±MÏ»¬3.0mÖÁBµãʱµÄËÙ¶ÈΪ¶à´ó£¿
£¨3£©µ±MÏ»¬3.0mÖÁBµãµÄ¹ý³ÌÖУ¬Éþ¶ÔM×öµÄ¹¦Îª¶à´ó£¿£¨gÈ¡10m/s2£©
·ÖÎö£º±¾ÌâµÄ¹Ø¼üÊÇ£º£¨1£©MºÍm×é³ÉµÄϵͳ»úеÄÜÊغ㣬¶øM»òmµÄ»úеÄܲ»Êغ㣬£¨2£©ÎïÌåmÉÏ»¬µÄλÒÆΪÉþ³¤OBÓëOAÖ®²î£¬£¨3£©MÓëmËٶȹØϵÂú×ã
v
 
2
=
v
 
1
sin¦È
½â´ð£º½â£º£¨1£©ÓÉÓÚÎïÌåmÉÏÉý¹ý³ÌÖУ¬²»Ö»ÊÇÖØÁ¦×ö¹¦£¬Éþ×ÓÀ­Á¦×öÕý¹¦£¬ËùÒÔÎïÌåmµÄ»úеÄܲ»Êغ㣬¸ù¾Ý¹¦ÄܹØϵ¡°³ýÖØÁ¦ÒÔÍâÆäËüÁ¦×öµÄ¹¦µÈÓÚÎïÌå»úеÄܵı仯¡±¿ÉÖªÎïÌåmµÄ»úеÄÜÔö¼Ó£¬ÇÒÔö¼ÓµÄ»úеÄܵÈÓÚÉþ×ÓÀ­Á¦¶ÔÎïÌåm×öµÄ¹¦£®
£¨2£©ÓÉÓÚÁ½¸öÎïÌå×é³ÉµÄϵͳÔÚÔ˶¯¹ý³ÌÖÐÖ»ÓÐÖØÁ¦×ö¹¦£¬ÏµÍ³»úеÄÜÊغ㣬ÉèMµ½BµãʱËÙ¶È
v
 
1
£¬mµÄËÙ¶ÈΪ
v
 
2
£¬ÔòÓУº
Mgh-mg£¨OB-OA£©sin¦È=
1
2
M
v
2
1
+
1
2
mv
2
2
  ¢Ù
ÓÉͼ¿ÉÖªOB=
O
A
2
 
+A
B
2
 
=5m£¬ËùÒÔsin¡ÏAOB=
AB
OB
=0.6£¬¼´¡ÏAOB=37¡ã£¬ÔÙ¸ù¾ÝËٶȵķֽ⣬°Ñv1ÑØOB·½Ïò·Ö½â£¬
ÓÐ
v
 
2
=
v
 
1
sin37¡ã¢Ú
ÁªÁ¢¢Ù¢Ú²¢´úÈëÊý¾Ý½âµÃ
v
 
1
=7.1m/s£®
¼´MÏ»¬ÖÁBµãʱµÄËÙ¶ÈΪ7.1m/s£®
£¨3£©¶ÔMÔËÓö¯Äܶ¨Àí£ºMgh+W=
1
2
M
v
2
1
-0
½âµÃW=-4.8J
¼´µ±MÏ»¬3mµÄ¹ý³ÌÖУ¬Éþ¶ÔM×öµÄ¹¦Îª-4.8J£®
µãÆÀ£ºÓöµ½Ï໥×÷ÓõÄϵͳÎÊÌ⣬ÈôûÓÐĦ²Á×èÁ¦Ó¦ÓÃϵͳ»úеÄÜÊغ㶨ÂÉÇó½â£»¶Ô¡°Ç£Á¬Ëٶȡ±ÎÊÌ⣬Ӧ¼Çס¡°Êµ¼ÊµÄËÙ¶ÈÊǺÏËٶȡ±ºÍ¡°ÑØÉþ×Ó·½ÏòµÄËÙ¶ÈÏàµÈ¡±µÄ½áÂÛ£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

£¨8·Ö£©ÈçͼËùʾ£¬Îï¿éMºÍmÓÃÒ»²»¿ÉÉ쳤µÄÇáÉþͨ¹ý¶¨»¬ÂÖÁ¬½Ó£¬m·ÅÔÚÇã½Ç=300µÄ¹Ì¶¨µÄ¹â»¬Ð±ÃæÉÏ£¬¶ø´©¹ýÊúÖ±¸ËPQµÄÎï¿éM¿ÉÑظËÎÞĦ²ÁµØÏ»¬£¬M=3m£¬¿ªÊ¼Ê±½«M̧¸ßµ½Aµã£¬Ê¹Ï¸Éþˮƽ£¬´ËʱOA¶ÎµÄÉþ³¤ÎªL=4.0m£¬ÏÖ½«MÓɾ²Ö¹¿ªÊ¼Ï»¬£¬Çóµ±MÏ»¬µ½3.0mÖÁBµãʱµÄËٶȣ¿£¨g=10m/s2£©

   

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2011ÄêºÓ±±Õý¶¨ÖÐѧ¸ßÈýµÚÈý´ÎÔ¿¼ÎïÀí¾í ÌâÐÍ£ºÑ¡ÔñÌâ

ÈçͼËùʾ£¬Îï¿éMºÍmÓÃÒ»²»¿ÉÉ쳤µÄÇáÉþͨ¹ý¶¨»¬ÂÖÁ¬½Ó£¬m·ÅÔÚÇã½Ç=300µÄ¹Ì¶¨µÄ¹â»¬Ð±ÃæÉÏ£¬¶ø´©¹ýÊúÖ±¸ËPQµÄÎï¿éM¿ÉÑظËÎÞĦ²ÁµØÏ»¬£¬M=3m£¬¿ªÊ¼Ê±½«M̧¸ßµ½Aµã£¬Ê¹Ï¸Éþˮƽ£¬´ËʱOA¶ÎµÄÉþ³¤ÎªL=4£®0m£¬ÏÖʹMÓɾ²Ö¹¿ªÊ¼Ï»¬£¬Ôòµ±MÏ»¬3£®0mÖÁBµãʱµÄËÙ¶ÈΪ£¨    £©£¨g=10m/s2£©

A£®7£®08m/s             B£®14£®2 m/s       C£®2£®3m/s       D£®1£®14m/s

 

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º ÌâÐÍ£º

ÈçͼËùʾ£¬Îï¿éMºÍmÓÃÒ»²»¿ÉÉ쳤µÄÇáÉþͨ¹ý¶¨»¬ÂÖÁ¬½Ó£¬m·ÅÔÚÇã½Ç=300µÄ¹Ì¶¨µÄ¹â»¬Ð±ÃæÉÏ£¬¶ø´©¹ýÊúÖ±¸ËPQµÄÎï¿éM¿ÉÑظËÎÞĦ²ÁµØÏ»¬£¬Îï¿éµÄÖÊÁ¿¹ØϵΪM=3m£®¿ªÊ¼Ê±M´¦ÓÚAµã£¬Ï¸Éþˮƽ£¬´ËʱOA¶ÎµÄÉþ³¤ÎªL = 4.0m£¬ÏÖ½«MÓɾ²Ö¹ÊÍ·Å£¬µ±MÏ»¬¸ß¶Èh =3.0mµ½´ïBµã£¬Çó´ËʱMµÄËٶȣ¿£¨g=10m/s2£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2011-2012ѧÄêÌì½òÊÐлªÖÐѧ¸ßÈý£¨ÉÏ£©µÚ¶þ´ÎÔ¿¼ÎïÀíÊÔ¾í£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

ÈçͼËùʾ£¬Îï¿éMºÍmÓÃÒ»²»¿ÉÉ쳤µÄϸÉþͨ¹ý¶¨»¬ÂÖÁ¬½Ó£¬m·ÅÔÚÇã½Ç¦È=37°µÄ¹Ì¶¨¹â»¬Ð±ÃæÉÏ£¬¶ø´©¹ýÊúÖ±¸ËPQµÄÎï¿éM¿ÉÑظËÎÞĦ²ÁµØÏ»¬£¬M=3m£¬¿ªÊ¼Ê±£¬½«M̧¸ßµ½Aµã£¬Ê¹Ï¸Éþˮƽ£¬´ËʱOA¶ÎÉþ³¤ÎªL=4.0m£¬ÏÖMÓɾ²Ö¹¿ªÊ¼Ï»¬£¬Ç󣺵±MÏ»¬3.0mÖÁBµãʱµÄËÙ¶ÈΪ¶à´ó£¿£¨gÈ¡10m/s2£©

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÎïÀí À´Ô´£º2011-2012ѧÄêÕã½­´óѧ¸½ÖиßÈý£¨ÉÏ£©ÆÚÖÐÎïÀíÊÔ¾í£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

ÈçͼËùʾ£¬Îï¿éMºÍmÓÃÒ»²»¿ÉÉ쳤µÄϸÉþͨ¹ý¶¨»¬ÂÖÁ¬½Ó£¬m·ÅÔÚÇã½Ç¦È=30°µÄ¹Ì¶¨¹â»¬Ð±ÃæÉÏ£¬¶ø´©¹ýÊúÖ±¸ËPQµÄÎï¿éM¿ÉÑظËÎÞĦ²ÁµØÏ»¬£¬M=3m=1Kg£¬¿ªÊ¼Ê±£¬½«M̧¸ßµ½Aµã£¬Ê¹Ï¸Éþˮƽ£¬´ËʱOA¶ÎÉþ³¤ÎªL=4.0m£¬ÏÖMÓɾ²Ö¹¿ªÊ¼Ï»¬£¬»Ø´ðÏÂÁÐÎÊÌ⣺
£¨1£©Îï¿émµÄ»úеÄÜÊÇ·ñÊغ㣿ÈôÊغ㣬Çë˵³öÀíÓÉ£»Èô²»Êغ㣬Çë˵³ö»úеÄÜÈçºÎ±ä»¯£¬±ä»¯µÄ´óСÓëʲôÁ¦×ö¹¦ÏàµÈ£¿
£¨2£©µ±MÏ»¬3.0mÖÁBµãʱµÄËÙ¶ÈΪ¶à´ó£¿
£¨3£©µ±MÏ»¬3.0mÖÁBµãµÄ¹ý³ÌÖУ¬Éþ¶ÔM×öµÄ¹¦Îª¶à´ó£¿£¨gÈ¡10m/s2£©

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸