ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Ï±íÊÇijƷÅÆС½Î³µµÄһЩ¼¼Êõ²ÎÊý£¬ÆäÖÐÅÅÆøÁ¿ÊÇÖ¸·¢¶¯»úÆû¸×µÄ¹¤×÷ÈÝ»ý£¬Ò»°ãÇé¿öÏ£¬·¢¶¯»úµÄÅÅÆøÁ¿Ô½´ó£¬¹¦ÂÊÔ½´ó£»¿Õȼ±ÈÊÇÖ¸Æû¸×ÄÚ¿ÕÆøºÍȼÓ͵ÄÖÊÁ¿±È£»ÆûÓ͵ÄÈÈÖµ±íʾÿǧ¿ËÆûÓÍÍêȫȼÉշųöµÄÈÈÁ¿.µ±¸Ã·¢¶¯»úÒÔ×î´ó¹¦Âʹ¤×÷ʱ£¬Æû¸×ÄÚÆûÓͺͿÕÆøµÄ»ìºÏÃܶÈΪ1.35 kg/m3£¬1minÄÚ¸ßθßѹµÄȼÆøÍƶ¯»îÈû×ö¹¦2600´Î.ÇëÄã¼ÆËã·¢¶¯»úÔÚ×î´ó¹¦Âʹ¤×÷ʱ
£¨1£©1 minÄÚ×öµÄÓÐÓù¦;
£¨2£©×ö¹¦Ò»´ÎÏûºÄÆûÓ͵ÄÖÊÁ¿;
£¨3£©·¢¶¯»úµÄЧÂÊ.
¡¾´ð°¸¡¿(1)4.5¡Á106J£»(2)1.62¡Á10-4kg£»(3)23.2%
¡¾½âÎö¡¿
ÊÔÌâ·ÖÎö£º£¨1£©1minÄÚ×öµÄÓÐÓù¦£ºW=Pt=7.5¡Á104 W¡Á60s=4.5¡Á106 J£®
£¨2£©¸ù¾Ý¦Ñ=m/V¿ÉµÃ£»×öÒ»´Î¹¦ÏûºÄȼÆøµÄÖÊÁ¿£ºm=¦ÑV=1.35kg/m3 ¡Á1.8¡Á10-3 m3 =2.43¡Á10-3 kg£¬ÒòΪ¿Õȼ±ÈÊÇ14£º1£¬ËùÒÔȼÓ͵ÄÖÊÁ¿ÊÇÕû¸öÖÊÁ¿µÄ1/15£¬×öÒ»´Î¹¦ÏûºÄµÄÆûÓÍÖÊÁ¿£º2.43¡Á10-3 kg¡Á1/15=1.62¡Á10-4 kg£®
£¨3£©1minÄÚ2600´Î×ö¹¦ÏûºÄµÄÆûÓÍÖÊÁ¿£ºm=1.62¡Á10-4 kg¡Á2600=0.4212kg£¬
1minÄÚÆûÓÍȼÉÕÊͷŵÄÈÈÁ¿£ºQ=mq=0.4212kg¡Á4.6¡Á107 J/kg=1.94¡Á107 J£¬
·¢¶¯»úµÄЧÂÊ£º¦Ç=W/Q¡Á100%=4.5¡Á106J/1.94¡Á107J¡Á100%¡Ö23.2%