ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿Ð¡ºéͬѧ¼ÒÔÀ´ÓÃÒº»¯Ê¯ÓÍÆøÉÕË®£¬Ã¿ÌìÔ¼ÓÃ60¡æµÄÈÈË®100kg.Ëý²Î¼Ó¡°Ì½¾¿ÐÔѧϰ¡±»î¶¯ºó£¬ÔÚÀÏʦָµ¼ºÍͬѧ°ïÖúÏ£¬ÖÆ×÷ÁËһ̨¼òÒ×µÄÌ«ÑôÄÜÈÈË®Æ÷.
£¨1£©ÈôÕą̂ÈÈË®Æ÷ÏÄÌìƽ¾ùÿÌì¿É½«100kgµÄË®´Ó20¡æ¼ÓÈȵ½60¡æ,ÕâЩˮÎüÊÕµÄÈÈÁ¿Îª¶àÉÙ£¿
£¨2£©ÈôÒº»¯Ê¯ÓÍÆøȼÉշųöµÄÈÈÁ¿ÓÐ70£¥±»Ë®ÎüÊÕ£¬Ëý¼Ò¸ÄÓÃÌ«ÑôÄÜÈÈË®Æ÷ºó£¬Æ½¾ùÿÌì¿É½ÚÔ¼Òº»¯Ê¯ÓÍÆø¶àÉÙǧ¿Ë£¿£¨Òº»¯Ê¯ÓÍÆøµÄÈÈֵΪ8.0¡Á107J/kg£©
£¨3£©ÇëÄã˵³öʹÓÃÌ«ÑôÄÜÈÈË®Æ÷µÄÓŵã.£¨ÖÁÉÙ˵³öÒ»µã£©
¡¾´ð°¸¡¿£¨1£©=1.68x107J
£¨2£©
£¨3£©Ì«ÑôÄܲ»ÎÛȾ»·¾³£¬²»²úÉú¶þÑõ»¯Ì¼£¬ÊǵÍ̼ÄÜÔ´¡£
¡¾½âÎö¡¿£¨1£©Ë®ÎüÊÕµÄÈÈÁ¿£º
QÎü=cm¡÷t=4.2¡Á103J/£¨kg¡æ£©¡Á100kg¡Á£¨60¡æ-20¡æ£©=1.68¡Á107J£»
£¨2£©¡ßQÎü=Q·Å¡Á70%£¬¡à£¬¡ßQ·Å=mÆøqÆø£¬¡à
£®
£¨3£©Ì«ÑôÄÜÈÈË®Æ÷Êǽ«Ì«ÑôÄÜת»¯ÎªÄÚÄÜ£¬±»Ë®ÎüÊÕ£¬Î¶ÈÉý¸ß£¬¹©ÈËʹÓ㬶Ի·¾³ÎÞÎÛȾ£®
´ð£º£¨1£©Ë®ÎüÊÕµÄÈÈÁ¿Îª1.68¡Á107J£»£¨2£©Æ½¾ùÿÌì¿É½ÚÔ¼Òº»¯Ê¯ÓÍÆø0.3ǧ¿Ë£»£¨3£©¶Ô»·¾³ÎÞÎÛȾ£®
![](http://thumb2018.1010pic.com/images/loading.gif)