ÌâÄ¿ÄÚÈÝ
![](http://thumb.1010pic.com/pic3/upload/images/201310/103/8c5a0089.png)
£¨1£©aͼºÍbͼÄĸöÊÇɳ×ÓÎüÈÈÉýεÄͼÏó£¿ÎªÊ²Ã´£¿
£¨2£©¼ÓÈÈÂú2minʱ£¬Ë®ÎüÊÕÁ˶àÉÙÈÈÁ¿£¿
£¨3£©¸øË®¼ÓÈȳÖÐøÁË10minʱ¼ä£¬¹²ÏûºÄÁ˶àÉپƾ«£¿ÕâЩ¾Æ¾«Èç¹ûÍêȫȼÉÕ½«·Å³ö¶àÉÙÈÈÁ¿£¿
£¨4£©ÊÔÇó³öɳ×ӵıÈÈÈÈÝ£®
·ÖÎö£º£¨1£©ÓÃÁ½Ö»ÍêÈ«ÏàͬµÄ¾Æ¾«µÆ£¬·Ö±ð¸øË®ºÍɳ×Ó¼ÓÈÈ£¬ÕâÑù×öµÄÄ¿µÄÊÇʹˮºÍɳ×ÓÔÚÏàͬʱ¼äÎüÊÕÏàͬµÄÈÈÁ¿£¬ÔÙÀûÓù«Ê½¡÷t=
½øÐзÖÎö£®
£¨2£©´ÓͼÏó¿ÉÖª£¬¼ÓÈÈÂú2min£¬Ë®µÄζȴÓ20¡æÉÏÉýµ½70¡æ£¬´Ó¶ø¿ÉÖªºÍË®µÄζȱ仯£¬ÒÑ֪ˮµÄÖÊÁ¿ºÍ±ÈÈÈÈÝ£¬¿ÉÀûÓù«Ê½QÎü=c?m?¡÷t¼ÆËãË®ÎüÊÕµÄÈÈÁ¿£®
£¨3£©ÒÑÖª¾Æ¾«µÆƽ¾ùÿ·ÖÖÓÏûºÄ0.8g¾Æ¾«£¬±ã¿ÉÒÔ¼ÆËã³ö¸øË®¼ÓÈÈ10minʱ¼äÏûºÄµÄ¾Æ¾«£¬ÒÑÖª¾Æ¾«µÄÈÈÖµ£¬¿ÉÀûÓù«Ê½Q·Å=mq¼ÆËãÈÈÁ¿£®
£¨4£©Ïàͬʱ¼äÄھƾ«µÆȼÉշųöÏàͬµÄÈÈÁ¿£¬´Ó£¨2£©¿ÉÖª£¬¼ÓÈÈ2minË®ÎüÊÕµÄÈÈÁ¿£¬ÒÑÖª¾Æ¾«µÄÖÊÁ¿ºÍ¼ÓÈÈ2min¾Æ¾«µÄζȱ仯£¬¿ÉÀûÓù«Ê½c=
¼ÆËãɳ×ӵıÈÈÈÈÝ£®
Q |
cm |
£¨2£©´ÓͼÏó¿ÉÖª£¬¼ÓÈÈÂú2min£¬Ë®µÄζȴÓ20¡æÉÏÉýµ½70¡æ£¬´Ó¶ø¿ÉÖªºÍË®µÄζȱ仯£¬ÒÑ֪ˮµÄÖÊÁ¿ºÍ±ÈÈÈÈÝ£¬¿ÉÀûÓù«Ê½QÎü=c?m?¡÷t¼ÆËãË®ÎüÊÕµÄÈÈÁ¿£®
£¨3£©ÒÑÖª¾Æ¾«µÆƽ¾ùÿ·ÖÖÓÏûºÄ0.8g¾Æ¾«£¬±ã¿ÉÒÔ¼ÆËã³ö¸øË®¼ÓÈÈ10minʱ¼äÏûºÄµÄ¾Æ¾«£¬ÒÑÖª¾Æ¾«µÄÈÈÖµ£¬¿ÉÀûÓù«Ê½Q·Å=mq¼ÆËãÈÈÁ¿£®
£¨4£©Ïàͬʱ¼äÄھƾ«µÆȼÉշųöÏàͬµÄÈÈÁ¿£¬´Ó£¨2£©¿ÉÖª£¬¼ÓÈÈ2minË®ÎüÊÕµÄÈÈÁ¿£¬ÒÑÖª¾Æ¾«µÄÖÊÁ¿ºÍ¼ÓÈÈ2min¾Æ¾«µÄζȱ仯£¬¿ÉÀûÓù«Ê½c=
Q |
m¡÷t |
½â´ð£º½â£º
£¨1£©Í¼a±íʾµÄÊÇɳ×ÓÎüÈÈÉýεĹý³Ì£¬
ÒòΪɳ×ÓºÍË®µÄÖÊÁ¿ÏàµÈ£¬ÎüÊÕÏàͬÈÈÁ¿Ê±£¬É³×ӵıÈÈÈÈݱÈˮС£¬
´Ó¹«Ê½¡÷t=
¿ÉÖª£¬É³×ÓζÈÉýµÃ¶à£®
£¨2£©¡ßcË®=4.2¡Á103J/£¨kg?¡æ£©£¬mË®=200g=0.2kg£¬¡÷tË®=70¡æ-20¡æ=50¡æ£¬
¡àQË®Îü=CË®mË®¡÷tË®=4.2¡Á103J/£¨kg?¡æ£©¡Á0.2kg¡Á£¨70¡æ-20¡æ£©=42000J£®
£¨3£©¡ß¾Æ¾«µÆƽ¾ùÿ·ÖÖÓÏûºÄ0.8g¾Æ¾«£¬
¡à¼ÓÈÈ10minʱ¼äÏûºÄµÄ¾Æ¾«Îª£»m=0.8g¡Á10=8g=8¡Á10-3kg£¬
Q·Å=mq=8¡Á10-3kg¡Á3.0¡Á107J/kg=2.4¡Á105J£®
£¨4£©¡ßÏàͬʱ¼äÄھƾ«µÆȼÉշųöÏàͬµÄÈÈÁ¿
¡àÔÚ2·ÖÖÓµÄʱ¼äÄÚ£¬
QɳÎü=QË®Îü=42000J£¬
ÓÖ¡ß¼ÓÈÈÂú2min£¬É³×ÓµÄζȴÓ20¡æÉÏÉýµ½250¡æ£¬
¡÷tɳ=250¡æ-20¡æ=230¡æ£¬mɳ=200g=0.2kg
¡àcɳ=
=
¡Ö9.13¡Á102J/£¨kg?¡æ£©£®
´ð£º£¨1£©Í¼a±íʾµÄÊÇɳ×ÓÎüÈÈÉýεĹý³Ì£»
ÒòΪɳ×ÓºÍË®µÄÖÊÁ¿ÏàµÈ£¬ÎüÊÕÏàͬÈÈÁ¿Ê±£¬É³×ӵıÈÈÈÈݱÈˮС£¬´Ó¹«Ê½¡÷t=
¿ÉÖª£¬É³×ÓζÈÉýµÃ¶à£®
£¨2£©Ë®ÎüÊÕÁË42000JµÄÈÈÁ¿£®
£¨3£©¹²ÏûºÄÁË8¡Á10-3kgµÄ¾Æ¾«£¬¾Æ¾«ÍêȫȼÉÕ½«·Å³ö2.4¡Á105JµÄÈÈÁ¿£®
£¨4£©É³×ӵıÈÈÈÈÝΪ9.13¡Á102J/£¨kg?¡æ£©£®
£¨1£©Í¼a±íʾµÄÊÇɳ×ÓÎüÈÈÉýεĹý³Ì£¬
ÒòΪɳ×ÓºÍË®µÄÖÊÁ¿ÏàµÈ£¬ÎüÊÕÏàͬÈÈÁ¿Ê±£¬É³×ӵıÈÈÈÈݱÈˮС£¬
´Ó¹«Ê½¡÷t=
Q |
cm |
£¨2£©¡ßcË®=4.2¡Á103J/£¨kg?¡æ£©£¬mË®=200g=0.2kg£¬¡÷tË®=70¡æ-20¡æ=50¡æ£¬
¡àQË®Îü=CË®mË®¡÷tË®=4.2¡Á103J/£¨kg?¡æ£©¡Á0.2kg¡Á£¨70¡æ-20¡æ£©=42000J£®
£¨3£©¡ß¾Æ¾«µÆƽ¾ùÿ·ÖÖÓÏûºÄ0.8g¾Æ¾«£¬
¡à¼ÓÈÈ10minʱ¼äÏûºÄµÄ¾Æ¾«Îª£»m=0.8g¡Á10=8g=8¡Á10-3kg£¬
Q·Å=mq=8¡Á10-3kg¡Á3.0¡Á107J/kg=2.4¡Á105J£®
£¨4£©¡ßÏàͬʱ¼äÄھƾ«µÆȼÉշųöÏàͬµÄÈÈÁ¿
¡àÔÚ2·ÖÖÓµÄʱ¼äÄÚ£¬
QɳÎü=QË®Îü=42000J£¬
ÓÖ¡ß¼ÓÈÈÂú2min£¬É³×ÓµÄζȴÓ20¡æÉÏÉýµ½250¡æ£¬
¡÷tɳ=250¡æ-20¡æ=230¡æ£¬mɳ=200g=0.2kg
¡àcɳ=
QɳÎü |
mɳ¡÷tɳ |
42000J |
0.2kg¡Á230¡æ |
´ð£º£¨1£©Í¼a±íʾµÄÊÇɳ×ÓÎüÈÈÉýεĹý³Ì£»
ÒòΪɳ×ÓºÍË®µÄÖÊÁ¿ÏàµÈ£¬ÎüÊÕÏàͬÈÈÁ¿Ê±£¬É³×ӵıÈÈÈÈݱÈˮС£¬´Ó¹«Ê½¡÷t=
Q |
cm |
£¨2£©Ë®ÎüÊÕÁË42000JµÄÈÈÁ¿£®
£¨3£©¹²ÏûºÄÁË8¡Á10-3kgµÄ¾Æ¾«£¬¾Æ¾«ÍêȫȼÉÕ½«·Å³ö2.4¡Á105JµÄÈÈÁ¿£®
£¨4£©É³×ӵıÈÈÈÈÝΪ9.13¡Á102J/£¨kg?¡æ£©£®
µãÆÀ£º´ËÌ⿼²éÁËѧÉú¶ÔÎüÈȹ«Ê½µÄÕÆÎÕºÍÔËÓ㬲¢¿ÉÀûÓù«Ê½¼ÆËãÈÈÁ¿ºÍ±ÈÈÈÈÝ£¬ÄÜ´ÓÒºÌåµÄζÈËæʱ¼ä±ä»¯µÄͼÏóËѼ¯ÓйØÐÅÏ¢ÊDZ¾ÌâµÄ¹Ø¼ü£®
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿