Question

һλͬѧ¶Ô¼ÒÀïÒûË®»úµÄ¹¤×÷Çé¿ö½øÐÐÁ˵÷²é£ºÒûË®»ú¼ÓÂúˮͨµçºóÓмÓÈȺͱ£ÎÂÁ½ÖÖ½»Ì湤×÷״̬(ÓÉ»úÄÚοؿª¹ØS×Ô¶¯¿ØÖÆ)£»´Ó¸Ã»ú˵Ã÷ÊéÉÏÊÕ¼¯µ½ÈçÏÂÊý¾Ý£º¼ÓÈÈÆ÷¶î¶¨µçѹΪ220V£¬¶î¶¨¹¦ÂÊΪ500W£»»úÄÚʢˮÈÝÆ÷µÄÈÝ»ýΪ5dm³¡£µ÷²é·¢ÏÖ£ºÕý³£¼ÓÈÈʱ£¬ÔÚ²»´ÓÒûË®»úÈ¡Ë®µÄÇé¿öÏ£¬Ë®ÎÂÓÉ85¡æ¿ªÊ¼ÔٴμÓÈÈ£¬¾­¹ý8minË®ÎÂÉýµ½95¡æʱֹͣ¼ÓÈÈ£¬¸Ã»ú¼ò»¯µç·Èçͼ19Ëùʾ¡£
£¨1£©Çë·ÖÎö˵Ã÷£ºÎ¿ؿª¹ØS¶Ï¿ªÊ±£¬ÒûË®»úÊÇ´¦ÓÚ¼ÓÈÈ»¹ÊDZ£ÎÂ״̬?
£¨2£©Õý³£¼ÓÈÈʱ£¬Çó¼ÓÈÈÆ÷µç×èR₂µÄ×èÖµ¼°Í¨¹ýµÄµçÁ÷¡£
£¨3£©ÔÚ8minµÄ¼ÓÈȹý³ÌÖÐÏûºÄµçÄÜΪ¶àÉÙ?»úÄÚÈÝÆ÷ÖÐË®µÄÄÚÄÜÔö¼ÓÁ˶àÉÙ?²¢¼òҪ˵Ã÷ËüÃDz»Í¬µÄÔ­Òò¡£[C_Ë®=4£®2¡Á10³J£¯(kg¡¤¡æ)]

Answer 1

½â£º(1)S±ÕºÏʱ£¬R₁±»¶Ì·£¬R₂Á½¶ËµÄµçѹµÈÓÚ220V£¬S¶Ï¿ªÊ±£¬R₁ÓëR₁´®Áª£¬R₁Á½¶ËµÄµçѹСÓÚ220V£¬¸ù¾ÝP=¿ÉÖª£¬S¶Ï¿ªÊ±R₂µÄ¹¦ÂʽÏС£¬Òò¶øΪ±£ÎÂ״̬¡£¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­£¨2·Ö£©
£¨2£©R₂===96£®8¦¸¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­(1·Ö)
I==¡Ö2£®3A¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­(1·Ö)
£¨3£©W=Pt=500W¡Á8¡Á60s=2£®4¡Á10⁵J¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­(1·Ö)
Q=cm(t-t₀)=4.2¡Á10³J/kg¡¤¡æ¡Á5kg¡Á(95-85) ¡æ=2£®1¡Á10⁵J (2·Ö)
Q£¼W,ÊÇÒòΪÔÚ¼ÓÈȵĹý³ÌÖÐÓÐÄÜÁ¿µÄËðʧ£¬¼´µçÁ÷²úÉúµÄÈÈÁ¿Ã»ÓÐÈ«²¿±»Ë®ÎüÊÕ¡£¡­½âÎö:
ÂÔ