Question

Ì«ÑôÄÜÈÈË®Æ÷ÊÇÖ±½ÓÀûÓÃÌ«ÑôÄܸøË®¼ÓÈȵÄ×°Öã¬Ï±íÊÇСÃ÷¼ÒµÄÌ«ÑôÄÜÈÈË®Æ÷ijÌìÔÚÑô¹âÕÕÉäϵÄÏà¹ØÐÅÏ¢

Ì«ÑôÕÕÉäʱ¼ä/h	×°Ë®Á¿/Kg	ÎüÈÈ°åÃæ»ý/m2	Ë®Éý¸ßµÄζÈ/¡æ	Ë®µÄ±ÈÈÈÈÝ/J£¨kg£®¡æ£©-1	Ì«Ñô·øÉ书ÂÊ/J£®£¨m2£®h£©-1
10	100	2.5	50	4.2¡Á103	1.68¡Á106

ÆäÖÐÌ«Ñô·øÉ书ÂÊÊÇÖ¸1hÄÚͶÉäµ½1m²Ãæ»ýÉϵÄÌ«ÑôÄÜ£®
Ç󣺣¨1£©Ë®ÔÚ10hÄÚÎüÊÕµÄÈÈÁ¿£»
£¨2£©Èç¹ûË®ÎüÊÕµÄÈÈÁ¿ÓÃÌìÈ»ÆøÀ´Ìṩ£¬ÐèÒªÍêȫȼÉÕ¶àÉÙm³µÄÌìÈ»Æø£»£¨ÌìÈ»ÆøµÄÈÈֵΪ8.4¡Ál0⁷J/m³£¬ÌìÈ»ÆøÍêȫȼÉշųöµÄÈÈÁ¿È«²¿¸øË®ÎüÊÕ£©
£¨3£©ÎüÈÈ°åÃæ»ýΪ2.5m²£¬ÈôÌ«ÑôÕÕÉäʱ¼äΪ10h£¬ÔòÎüÈÈ°å¹²ÎüÊÕ¶àÉÙÌ«ÑôÄÜ£¿¸ÃÌ«ÑôÄÜÈÈË®Æ÷µÄÄÜÁ¿×ª»¯Ð§ÂÊΪ¶àÉÙ£¿

Answer 1

·ÖÎö£º£¨1£©ÓɱíÖÐÊý¾ÝÖªµÀË®µÄÖÊÁ¿¡¢Ë®µÄ±ÈÈÈÈÝ¡¢Ë®µÄζÈÉý¸ßÖµ£¬ÀûÓÃÎüÈȹ«Ê½Q_Îü=cm¡÷tÇóË®ÎüÊÕµÄÈÈÁ¿£¨ÓÐÓÃÄÜÁ¿£©£»
£¨2£©Èç¹ûË®ÎüÊÕµÄÈÈÁ¿ÓÃÌìÈ»ÆøÀ´Ìṩ£¬¼´Q_·Å=Q_Îü£¬ÔÙÀûÓÃQ_·Å=vqÇóÐèÒªÍêȫȼÉÕ¶àÉÙÌìÈ»Æø£»
£¨3£©ÓÉÌ«Ñô·øÉ书ÂÊÖªµÀ1hÄÚͶÉäµ½1m²Ãæ»ýÉϵÄÌ«ÑôÄÜ£¬¾Ý´ËÇó³ö10hÎüÊÕµÄÌ«ÑôÄÜ£¨×ÜÄÜÁ¿£©£¬ÔÙÀûÓÃЧÂʹ«Ê½ÇóÌ«ÑôÄÜÈÈË®Æ÷µÄÄÜÁ¿×ª»¯Ð§ÂÊ£®

½â´ð£ºÒÑÖª£ºË®µÄÖÊÁ¿m=100kg£¬Ë®Éý¸ßµÄζȡ÷t=50¡æ£¬Ë®µÄ±ÈÈÈc=4.2¡Á10³J/£¨kg?¡æ£©£¬Ì«Ñô·øÉ书ÂÊP=1.68¡Á10⁶J/£¨m2?h£©£¬Ê±¼ät=10h£¬ÌìÈ»ÆøµÄÈÈֵΪq=8.4¡Ál0⁷J/m³£¬ÎüÈÈ°åÃæ»ýΪS=2.5m²£®
Ç󣺣¨1£©Ë®ÔÚ10hÄÚÎüÊÕµÄÈÈÁ¿Q_Îü=£¿£»£¨2£©ÍêȫȼÉÕÌìÈ»ÆøµÄÌå»ýV=£¿£»£¨3£©ÎüÈÈ°å¹²ÎüÊÕÌ«ÑôÄÜQ_×Ü=£¿£»Ì«ÑôÄÜÈÈË®Æ÷µÄÄÜÁ¿×ª»¯Ð§ÂʦÇ=£¿
½â£º£¨1£©Ë®ÎüÊÕµÄÈÈÁ¿£¨ÓÐÓÃÄÜÁ¿£©£º
Q_Îü=cm¡÷t=4.2¡Á10³J/£¨kg?¡æ£©¡Á100kg¡Á50¡æ=2.1¡Á10⁷J£»
£¨2£©ÓÉÌâÖª£¬Q_·Å=vq=Q_Îü=2.1¡Á10⁷J£¬
ÐèÒªÌìÈ»ÆøµÄÌå»ý£º
v=

Q·Å

q

=

2.1¡Á107J

8.4¡Á107J/kg

=0.25m³£»
£¨3£©10hÌ«ÑôÄÜÈÈË®Æ÷ÎüÊÕµÄÌ«ÑôÄÜ£¨×ÜÄÜÁ¿£©£º
Q_×Ü=1.68¡Á10⁶J/£¨m²?h£©¡Á2.5m²¡Á10h=4.2¡Á10⁷J£¬
¦Ç=

QÎü

Q×Ü

¡Á100%=

2.1¡Á107J

4.2¡Á107J

¡Á100%=50%£®
´ð£º£¨1£©Ë®ÔÚ10hÄÚÎüÊÕµÄÈÈÁ¿Îª2.1¡Á10⁷J£»
£¨2£©Èç¹ûË®ÎüÊÕµÄÈÈÁ¿ÓÃÌìÈ»ÆøÀ´Ìṩ£¬ÐèÒªÍêȫȼÉÕ0.25m³µÄÌìÈ»Æø£»
£¨3£©ÎüÈÈ°å¹²ÎüÊÕÌ«ÑôÄÜ4.2¡Á10⁷J£»¸ÃÌ«ÑôÄÜÈÈË®Æ÷µÄÄÜÁ¿×ª»¯Ð§ÂÊΪ50%£®

µãÆÀ£º±¾Ì⿼²éÁËѧÉú¶ÔÎüÈȹ«Ê½¡¢È¼ÁÏÍêȫȼÉÕ·ÅÈȹ«Ê½¡¢Ð§Âʹ«Ê½µÄÕÆÎÕºÍÔËÓ㬱¾Ìâ¹Ø¼ü£ºÒ»ÊÇÄÜ´ÓÌâÄ¿ÌṩµÄ±í¸ñÖеõ½Ïà¹ØÐÅÏ¢£¬¶þÊÇ×¢ÒâÈÈÖµµ¥Î»£º¹ÌÌå¡¢ÒºÌåȼÁÏ£¨J/kg£©ºÍÆøÌåȼÁÏJ/m³µÄÇø±ð£®