ÌâÄ¿ÄÚÈÝ
Öйúº£¾ü½¨¾ü60ÖÜÄê¼ÍÄîÈÕ£¬¾ÙÐÐÁ˺£ÉÏÔıøÒÇʽ£¬Õ¹Ê¾ÁËÖйúº£¾üµÄ¾üÍþ£®ÈçͼËùʾÊǺ£ÉÏÔıøµÄ²¿·Ö³¡¾°£¬ÆäÖвμÓÑÝÏ°µÄijËÒ¾ü½¢ÅÅË®Á¿Îª3000¶Ö£®ÇëÄã»Ø´ðÒÔÏÂÎÊÌ⣨º£Ë®µÄÃܶÈÊÓΪˮµÄÃܶȣ©£º£¨gÈ¡10N/kg£©£¨1£©µ±ÕâËÒ¾ü½¢ÂúÔØÐÐʻʱÊܵ½µÄ¸¡Á¦ÊǶàÉÙN£¿
£¨2£©ÕâËÒ¾ü½¢ÂúÔØÐÐʻʱÅÅ¿ªË®µÄÌå»ýÊǶàÉÙ£¿
£¨3£©Ð¶ÏÂÒ»Åú×°±¸ºó£¬ÕâËÒ¾ü½¢ËùÊܵĸ¡Á¦______£¨Ìî¡°±ä´ó¡±¡¢¡°²»±ä¡±»ò¡°±äС¡±£©£¬¾ü½¢______£¨Ìî¡°Éϸ¡¡±»ò¡°Ï³Á¡±£©Ò»Ð©£®
£¨4£©ÈôжÏÂÒ»Åú×°±¸ºó£¬ÕâËÒ¾ü½¢ÅÅ¿ªË®µÄÌå»ý¼õÉÙÁË60m3£¬ÄÇôжϵÄÕâÅú×°±¸µÄÖÊÁ¿ÊǶàÉÙkg£¿

¡¾´ð°¸¡¿·ÖÎö£º£¨1£©ÖªµÀ¾ü½¢ÅÅË®Á¿£¨ÂúÔØʱÅÅ¿ªË®µÄÖÊÁ¿£©£¬ÀûÓÃÖØÁ¦¹«Ê½Çó¾ü½¢ÂúÔØʱÊܵ½µÄÖØÁ¦£¬ÔÙ¸ù¾ÝƯ¸¡Ìõ¼þÇó¾ü½¢Êܵ½µÄ¸¡Á¦£»
£¨2£©ÒÑÖª¾ü½¢Êܵ½µÄ¸¡Á¦ºÍË®µÄÃܶȣ¬Óð¢»ùÃ×µÂÔÀíÍƵ¼¹«Ê½VÅÅ=
¼ÆËãÅÅ¿ªË®µÄÌå»ý£®
£¨3£©¸ù¾ÝƯ¸¡Ìõ¼þ·ÖÎö´¬Êܵ½¸¡Á¦µÄ±ä»¯Çé¿ö£¬ÔÙ¸ù¾Ý°¢»ùÃ×µÂÔÀíÅжÏÅÅ¿ªË®µÄÌå»ýµÄ±ä»¯£¬´Ó¶øµÃ³ö¾ü½¢ÊÇÉϸ¡»¹ÊÇϳÁ£®
£¨4£©ÖªµÀ¾ü½¢ÅÅ¿ªË®µÄÌå»ý¼õÉÙÖµ£¬ÀûÓð¢»ùÃ×µÂÔÀíÇó¾ü½¢Êܵ½¸¡Á¦µÄ¼õСֵ£»¸ù¾ÝƯ¸¡Ìõ¼þÇóжϵÄÕâÅú×°±¸Êܵ½µÄÖØÁ¦£¬ÔÙÀûÓÃÖØÁ¦¹«Ê½Çó×°±¸µÄÖÊÁ¿£®
½â´ð£º½â£º£¨1£©ÂúÔØʱ¾ü½¢µÄÅÅ¿ªË®µÄÖÊÁ¿£º
m=3000t=3000×103kg=3×106kg£¬
¾ü½¢ÂúÔØʱÊܵ½µÄ¸¡Á¦£º
F¸¡=GÅÅ=mg=3×106kg×10N/kg3=3×107N£»
£¨2£©¡ßF¸¡=¦ÑË®vÅÅg£¬
¡à¾ü½¢ÅÅ¿ªº£Ë®µÄÌå»ý£º
VÅÅ=
=
=3×103m3£¬
£¨3£©ÓÉÌâÒâÖª£¬Ð¶ÏÂÒ»Åú×°±¸ºó£¬ÕâËÒ¾ü½¢µÄÖØÁ¦¼õС£¬µ«ÈÔÈ»ÊÇƯ¸¡£¬ÓÉÓÚÎïÌåƯ¸¡Ê±£¬¸¡Á¦µÈÓÚÖØÁ¦£¬ËùÒÔжÏÂÒ»Åú×°±¸ºó£¬ÕâËÒ¾ü½¢ËùÊܵĸ¡Á¦±äС£®
¡ßF¸¡=¦ÑË®vÅÅg£¬
¡àÕâËÒ¾ü½¢ËùÊܵĸ¡Á¦±äСʱ£¬VÅÅËæÖ®¼õС£¬ËùÒÔ¾ü½¢½«Éϸ¡Ò»Ð©£®
£¨4£©¡ß¾ü½¢Æ¯¸¡£¬
¡à¼õСµÄ¸¡Á¦µÈÓÚжÏÂ×°±¸µÄÖØÁ¦£¬
¼´£º¡÷G=¡÷F¸¡=¡÷GÅÅ¡ä=¦ÑÒºg¡÷VÅÅ=1.0×103kg/m3×10N/kg×60m3=6×105N£¬
жϵÄ×°±¸µÄÖÊÁ¿£ºm=
=
=6×104kg£®
´ð£º£¨1£©µ±ÕâËÒ¾ü½¢ÂúÔØÐÐʻʱÊܵ½µÄ¸¡Á¦ÊÇ3×107N£®
£¨2£©ÕâËÒ¾ü½¢ÂúÔØÐÐʻʱÅÅ¿ªË®µÄÌå»ýÊÇ3×103m3£®
£¨3£©±äС£»Éϸ¡£®
£¨4£©Ð¶ÏµÄÕâÅú×°±¸µÄÖÊÁ¿ÊÇ6×104kg£®
µãÆÀ£º±¾Ì⿼²éÁËѧÉú¶ÔÖØÁ¦¹«Ê½¡¢°¢»ùÃ×µÂÔÀíºÍƯ¸¡Ìõ¼þµÄÕÆÎÕºÍÔËÓã¬ÓúÃƯ¸¡Ìõ¼þF¸¡=GÊDZ¾ÌâµÄ¹Ø¼ü£®
£¨2£©ÒÑÖª¾ü½¢Êܵ½µÄ¸¡Á¦ºÍË®µÄÃܶȣ¬Óð¢»ùÃ×µÂÔÀíÍƵ¼¹«Ê½VÅÅ=

£¨3£©¸ù¾ÝƯ¸¡Ìõ¼þ·ÖÎö´¬Êܵ½¸¡Á¦µÄ±ä»¯Çé¿ö£¬ÔÙ¸ù¾Ý°¢»ùÃ×µÂÔÀíÅжÏÅÅ¿ªË®µÄÌå»ýµÄ±ä»¯£¬´Ó¶øµÃ³ö¾ü½¢ÊÇÉϸ¡»¹ÊÇϳÁ£®
£¨4£©ÖªµÀ¾ü½¢ÅÅ¿ªË®µÄÌå»ý¼õÉÙÖµ£¬ÀûÓð¢»ùÃ×µÂÔÀíÇó¾ü½¢Êܵ½¸¡Á¦µÄ¼õСֵ£»¸ù¾ÝƯ¸¡Ìõ¼þÇóжϵÄÕâÅú×°±¸Êܵ½µÄÖØÁ¦£¬ÔÙÀûÓÃÖØÁ¦¹«Ê½Çó×°±¸µÄÖÊÁ¿£®
½â´ð£º½â£º£¨1£©ÂúÔØʱ¾ü½¢µÄÅÅ¿ªË®µÄÖÊÁ¿£º
m=3000t=3000×103kg=3×106kg£¬
¾ü½¢ÂúÔØʱÊܵ½µÄ¸¡Á¦£º
F¸¡=GÅÅ=mg=3×106kg×10N/kg3=3×107N£»
£¨2£©¡ßF¸¡=¦ÑË®vÅÅg£¬
¡à¾ü½¢ÅÅ¿ªº£Ë®µÄÌå»ý£º
VÅÅ=


£¨3£©ÓÉÌâÒâÖª£¬Ð¶ÏÂÒ»Åú×°±¸ºó£¬ÕâËÒ¾ü½¢µÄÖØÁ¦¼õС£¬µ«ÈÔÈ»ÊÇƯ¸¡£¬ÓÉÓÚÎïÌåƯ¸¡Ê±£¬¸¡Á¦µÈÓÚÖØÁ¦£¬ËùÒÔжÏÂÒ»Åú×°±¸ºó£¬ÕâËÒ¾ü½¢ËùÊܵĸ¡Á¦±äС£®
¡ßF¸¡=¦ÑË®vÅÅg£¬
¡àÕâËÒ¾ü½¢ËùÊܵĸ¡Á¦±äСʱ£¬VÅÅËæÖ®¼õС£¬ËùÒÔ¾ü½¢½«Éϸ¡Ò»Ð©£®
£¨4£©¡ß¾ü½¢Æ¯¸¡£¬
¡à¼õСµÄ¸¡Á¦µÈÓÚжÏÂ×°±¸µÄÖØÁ¦£¬
¼´£º¡÷G=¡÷F¸¡=¡÷GÅÅ¡ä=¦ÑÒºg¡÷VÅÅ=1.0×103kg/m3×10N/kg×60m3=6×105N£¬
жϵÄ×°±¸µÄÖÊÁ¿£ºm=


´ð£º£¨1£©µ±ÕâËÒ¾ü½¢ÂúÔØÐÐʻʱÊܵ½µÄ¸¡Á¦ÊÇ3×107N£®
£¨2£©ÕâËÒ¾ü½¢ÂúÔØÐÐʻʱÅÅ¿ªË®µÄÌå»ýÊÇ3×103m3£®
£¨3£©±äС£»Éϸ¡£®
£¨4£©Ð¶ÏµÄÕâÅú×°±¸µÄÖÊÁ¿ÊÇ6×104kg£®
µãÆÀ£º±¾Ì⿼²éÁËѧÉú¶ÔÖØÁ¦¹«Ê½¡¢°¢»ùÃ×µÂÔÀíºÍƯ¸¡Ìõ¼þµÄÕÆÎÕºÍÔËÓã¬ÓúÃƯ¸¡Ìõ¼þF¸¡=GÊDZ¾ÌâµÄ¹Ø¼ü£®

Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿