ÌâÄ¿ÄÚÈÝ
¡¾ÌâÄ¿¡¿ÈçͼËùʾµÄ×°ÖÃÖУ¬Á½¸ö¹³ÂëÖØÁ¦²»µÈ£¬ÊͷźóÖع³ÂëϽµ£¬Çá¹³ÂëÉÏÉý£¬È»ºó·´¸´¶Ôµ÷×óÓÒÁ½¸ö¹³Â룬ͨ¹ý´«¶¯×°ÖÿÉʵÏÖ£ºÔÚ¹³ÂëÉý½µ¹ý³ÌÖУ¬ÄÜʹ·ÅÔÚ¸ôÈÈÈÝÆ÷Ë®ÖеÄÒ¶ÂÖ²»Í£µÄת¶¯£®
£¨1£©Ò¶ÂÖÔÚ²»Í£µØתµ½¹ý³ÌÖУ¬¿ÉÒÔÖªµÀÈÝÆ÷ÖÐË®µÄÎÂ¶È £¬ ÔÒòÊÇ£ºÒ¶ÂÖͨ¹ý·½Ê½ÊµÏÖÁËÄÜÁ¿µÄת»¯£®
£¨2£©ÊµÑéÖй³ÂëÉý½µ×ö¹¦Óëˮα仯µÄÊý¾ÝÈçϱíËùʾ¡¾ÈÝÆ÷ÖÐË®µÄÖÊÁ¿Îª500g£¬cË®=4.2¡Á103J/£¨kg¡æ£©¡¿
¹³ÂëÉý½µ´ÎÊý | 1 | 2 | 3 |
¹³ÂëÉý½µ×ö¹¦/J | 425 | 850 | 1275 |
ˮεı仯/¡æ | 0.2 | 0.4 | 0.6 |
ÔÚ¹³ÂëÉý½µ1´ÎµÄ¹ý³ÌÖУ¬ÈÝÆ÷ÖеÄË®ÎüÊÕµÄÈÈÁ¿ÎªJ£®¶Ô±È·¢ÏÖ£¬Ë®ÎüÊÕµÄÈÈÁ¿ÓÚ¶ÔÓ¦µÄ¹³ÂëÉý½µËù×öµÄ¹¦£®
£¨3£©×ۺϷÖÎöʵÑé×°Öü°±í¸ñÖеÄÊý¾Ý£¬ÄãÈÏΪ¸ÃʵÑéÖÐÄÜÁ¿ËðʧÖ÷ÒªÀ´Ô´ÓÚ £® £¨Ö»Ð´³öÆäÖÐÒ»Ìõ¼´¿É£©
¡¾´ð°¸¡¿
£¨1£©Éý¸ß£»×ö¹¦
£¨2£©420£»Ð¡
£¨3£©ÈÈÁ¿ÏòÍâɢʧ£¨ÈÝÆ÷ºÍÒ¶ÂÖµÈÎüÈÈ¡¢²¿¼þ¼äµÄĦ²ÁµÈ£©
¡¾½âÎö¡¿½â£º£¨1£©ÓÉÌâÒâÖª£¬Ò¶ÂÖÔÚ²»Í£µØתµ½¹ý³ÌÖУ¬¿ÉÒÔÖªµÀÈÝÆ÷ÖÐË®µÄζÈÉý¸ß£¬ÕâÊÇÒòΪҶÂÖͨ¹ý×ö¹¦µÄ·½Ê½ÊµÏÖÁËÄÜÁ¿µÄת»¯£®£¨2£©ÔÚ¹³ÂëÉý½µ1´ÎµÄ¹ý³ÌÖУ¬ÈÝÆ÷ÖеÄË®ÎüÊÕµÄÈÈÁ¿£ºQ=cm¡÷t=4.2¡Á103J/£¨kg¡æ£©¡Á0.5kg¡Á0.2¡æ=420J£»
ÓÉÓÚÈÈÁ¿µÄËðºÄ£¬ÕâÒ»ÈÈÁ¿»áСÓÚ¹³ÂëËù×öµÄ¹¦£®£¨3£©ÔÚʵÑéÖУ¬Ôì³ÉÄÜÁ¿ËðʧµÄÖ÷ÒªÀ´Ô´ÓÐÈÈÁ¿ÏòÍâɢʧ¡¢ÈÝÆ÷ºÍÒ¶ÂÖµÈÎüÈÈ¡¢²¿¼þ¼äµÄĦ²ÁµÈ£®ËùÒÔ´ð°¸ÊÇ£º£¨1£©Éý¸ß£»×ö¹¦£»£¨2£©420£»Ð¡£»£¨3£©ÈÈÁ¿ÏòÍâɢʧ£¨ÈÝÆ÷ºÍÒ¶ÂÖµÈÎüÈÈ¡¢²¿¼þ¼äµÄĦ²ÁµÈ£©£®
¡¾¿¼µã¾«Îö¡¿ÕÆÎÕ×ö¹¦¸Ä±äÎïÌåÄÚÄܵÄʵÖʺÍÈÈÁ¿µÄ¼ÆËãÊǽâ´ð±¾ÌâµÄ¸ù±¾£¬ÐèÒªÖªµÀÎïÌå¶ÔÍâ×ö¹¦£¬ÎïÌåµÄÄÚÄܼõС£»Íâ½ç¶ÔÎïÌå×ö¹¦£¬ÎïÌåµÄÄÚÄÜÔö´ó£»ÈÈÁ¿µÄ¼ÆË㣺 ¢Ù QÎü = cm¡÷tÉý=cm(t-t0) £¨QÎüÊÇÎüÊÕÈÈÁ¿£¬µ¥Î»Êǽ¹¶ú£»c ÊÇÎïÌå±ÈÈÈ£¬µ¥Î»ÊÇ£º½¹/(ǧ¿Ë?¡æ)£»mÊÇÖÊÁ¿£»t0 Êdzõʼζȣ»t ÊǺóÀ´µÄζȣ® £©¢Ú Q·Å =cm¡÷t½µ=cm(t0-t) ¢Û QÎü = Q·Å£®