初中物理热量的计算 初中物理计算热量的公式是怎么推导出来的
\u521d\u4e2d\u7269\u7406\u70ed\u91cf\u548b\u7b97\uff0c\u548c\u70ed\u503c\u6709\u5565\u533a\u522b\u70ed\u91cf\u662f\u53ea\u5728\u70ed\u4f20\u9012\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\u624d\u4f1a\u6709\u7684\u4e00\u4e2a\u7269\u7406\u91cf\uff0c\u6ce8\u610f\uff0c\u662f\u5728\u70ed\u4f20\u9012\u8fc7\u7a0b\u4e2d\u624d\u6709\u7684\uff0c\u5e73\u65f6\u8bf4\u4ec0\u4e48\u4ec0\u4e48\u7684\u70ed\u91cf\u662f\u591a\u5c11\u90fd\u662f\u4e0d\u79d1\u5b66\u7684\u8bf4\u6cd5\uff0c\u5728\u70ed\u4f20\u9012\u4e2d\uff0c\u6e29\u5ea6\u8f83\u9ad8\u7684\u7269\u4f53\u5c06\u80fd\u91cf\u4f20\u7ed9\u6e29\u5ea6\u8f83\u4f4e\u7684\u7269\u4f53\uff0c\u4f20\u9012\u4e86\u591a\u5c11\u80fd\u91cf\uff0c\u5c31\u6709\u591a\u5c11\u70ed\u91cf\uff0c\u4ee5Q\u8868\u793a\u7269\u4f53\u5438\u6536\u7684\u70ed\u91cf\uff0cc\u8868\u793a\u7269\u8d28\u7684\u6bd4\u70ed\u5bb9\uff0cm\u8868\u793a\u7269\u4f53\u7684\u8d28\u91cf\uff0ct0\u8868\u793a\u7269\u4f53\u52a0\u70ed\u94b1\u7684\u6e29\u5ea6\uff0ct1\u8868\u793a\u7269\u4f53\u52a0\u70ed\u540e\u7684\u8d28\u91cf\uff0c\u90a3\u4e48Q=cm\uff08t1\uff0dt0\uff09\uff1b\u70ed\u503c\u662f\u4e00\u4e2a\u7269\u4f53\u7684\u6027\u8d28\uff0c\u5728\u7269\u7406\u53d8\u5316\u4e2d\u6c38\u8fdc\u4e0d\u4f1a\u6539\u53d8\uff0c\u6211\u4eec\u628a1kg\u7684\u67d0\u79cd\u71c3\u6599\u201c\u5b8c\u5168\u71c3\u70e7\u201d\u65f6\u91ca\u653e\u7684\u70ed\u91cf\uff0c\u79f0\u4e3a\u8fd9\u4e2a\u7269\u8d28\u7684\u70ed\u503c\uff0c\u8bb0\u4f4f\uff0c\u5b8c\u5168\u71c3\u70e7\uff01\u70ed\u503c\u7684\u5355\u4f4d\u662f\u7126/\u5343\u514b\uff0c\u628aq\u770b\u505a\u7269\u8d28\u7684\u70ed\u503c\uff0c\u5219Q=mq\u3002\u81ea\u5df1\u603b\u7ed3\u7684\u3002
\u8868\u793a\u5dee\u91cf\uff0c\u6bd4\u65b9\u8bf4\u539f\u5148\u67d0\u6db2\u4f53\u7684\u8d28\u91cf\u4e3am\uff0c\u589e\u52a0\u4e86\u4e00\u4e9b\u540e\uff0c\u8d28\u91cf\u53d8\u4e3am'\uff0c\u90a3\u4e48\u589e\u52a0\u7684\u8d28\u91cf\u79f0\u4e3a\u4e09\u89d2\u5f62m(\u624b\u673a\u6253\u4e0d\u51fa\u4e09\u89d2\uff0c\u62b1\u6b49\uff0c\u5176\u5b9e\u8fd9\u4e2a\u4e09\u89d2\u8bfb\u6cd5\u4e0e\u6570\u5b66\u4e2db^2-4ac\u6539\u53d8\u7684\u8bfb\u97f3\u76f8\u540c\u3002\u989d\u3001\u8c10\u97f3\u201c\u86cb\u5854\u201d)
C\u4e59\uff1eC\u7532 \u7b80\u5355\u70b9\u8bf4\u5c31\u662f\u63a7\u5236\u53d8\u91cf\uff0c\u552f\u4e00\u53d8\u7684\u662f\u6c34\u7684\u672b\u6e29\uff0c\u6c34\u6e29\u5ea6\u5347\u7684\u8d8a\u9ad8\uff0c\u8bf4\u660e\u5438\u6536\u70ed\u91cf\u8d8a\u591a\u3002\u4e5f\u5c31\u662f\u4e59\u653e\u51fa\u70ed\u91cf\u591a\uff0c\u5982\u679c\u4f60\u4f1a\u70b9\u6bd4\u70ed\u5bb9\u77e5\u8bc6\u7684\u8bdd\uff0c\u73b0\u5728\u5c31\u5e94\u8be5\u77e5\u9053\u4e86\u3002\u53ef\u4ee5\u7528Q=cm t\uff08\u4e0d\u597d\u610f\u601d\uff0ct\u524d\u7684\u7b26\u53f7\u6253\u4e0d\u51fa\u6765\uff0c\u4f60\u660e\u767d\u5c31\u884c\u3002\uff09\u6765\u63a8\u7b97\u3002 \u6ca1\u9519\u554a\uff1f
△t=1.76*10^3/(0.13*10^3*0.5)℃
≈27。℃
谢谢 初中物理有问题可以请教我
Q=cm△t
△t=Q/cm=1.76*10^3/0.5*0.13*10^3=27.1℃
绛旓細璁＄畻鍏紡锛氾紙1锛夊浐浣撶噧鏂欏畬鍏ㄧ噧鐑ч噴鏀剧殑鐑噺鐨勮绠楀叕寮忥細Q鏀=mq銆俀琛ㄧず鐑噺(J)锛宷琛ㄧず鐑( J/kg )锛宮琛ㄧず鍥轰綋鐕冩枡鐨勮川閲(kg)銆傦紙2锛夋皵浣撶噧鏂欏畬鍏ㄧ噧鐑ч噴鏀剧殑鐑噺鐨勮绠楀叕寮忥細Q=Vq銆俀琛ㄧず鐑噺(J)锛宷琛ㄧず鐑( J/kg )锛孷琛ㄧず姘斾綋鐕冩枡鐨勪綋绉(m³锛夈傦紙3锛夌粡鏌愪竴杩囩▼娓╁害鍙樺寲涓衡柍t锛屽畠鍚...
绛旓細澶嶄範锛鍏充簬鐑噺鐨勮绠桻=mq锛堢敤浜庡浐浣撱佹恫浣撶噧鏂锛変竴銆佺噧鏂欐斁鐑绠楀叕寮忥細Q=Vq锛堢敤浜庢皵浣撶噧鏂欙級浜屻佺墿浣撴俯搴﹀彉鍖栫殑鍚告斁鐑叕寮忥細姣旂儹瀹癸細c螖t璐ㄩ噺锛歮Q鍚=cm螖t姣旂儹瀹癸細c螖t璐ㄩ噺锛歮Q鏀=cm螖t銆愮粌涔1銆戠敤鐕冩皵鐏剁儳姘达紝鐕冪儳0.5kg鐨勭叅姘旓紝浣50kg鐨勬按浠20鈩冭韩楂樺埌70鈩冿紝宸茬煡姘寸殑姣旂儹瀹逛负4.2脳103J/(...
绛旓細娉ㄦ剰锛1鍗冨崱=1000鍗=1000鍗¤矾閲=4184鐒﹁=4.184鍗冪劍 渚嬮璇﹁В锛氫緥1 灏100g姘翠粠20鈩冨姞鐑嚦90鈩冿紝瑕佷緵缁欏灏戠儹閲?涓鏍归搧閽夌殑璐ㄩ噺绾10g锛屼粠1000鈩冪殑绾㈢儹鐘舵佸喎鍗磋嚦25鈩冿紝浼氭斁鍑哄灏戠儹閲?[c姘=4.2× 103J/(kg·鈩);c閾=0.46×103J/(kg·鈩)]瑙ｆ瀽锛氭按鍚告敹鐨勭儹閲廞鍚=...
绛旓細t1琛ㄧず鐗╀綋鍔犵儹鍚庣殑璐ㄩ噺锛岄偅涔圦=cm锛坱1锛峵0锛锛涚儹鍊兼槸涓涓墿浣撶殑鎬ц川锛屽湪鐗╃悊鍙樺寲涓案杩滀笉浼氭敼鍙橈紝鎴戜滑鎶1kg鐨勬煇绉嶇噧鏂欌滃畬鍏ㄧ噧鐑р濇椂閲婃斁鐨勭儹閲忥紝绉颁负杩欎釜鐗╄川鐨勭儹鍊硷紝璁颁綇锛屽畬鍏ㄧ噧鐑э紒鐑肩殑鍗曚綅鏄劍/鍗冨厠锛屾妸q鐪嬪仛鐗╄川鐨勭儹鍊硷紝鍒橯=mq銆傝嚜宸辨荤粨鐨勩
绛旓細5. 鐑闄や互璐ㄩ噺寰楀埌姣旂儹瀹癸紝鍗砪=C/m=螖Q/m螖T銆6. 瀵逛簬寰皬杩囩▼鐨勭儹瀹瑰拰姣旂儹瀹癸紝鍒嗗埆鏈塁=dQ/dT鍜宑=1/m*dQ/dT銆7. 鍥犳锛屽湪鐗╀綋娓╁害鐢盩1鍙樺寲鍒癟2鐨勬湁闄愯繃绋嬩腑锛屽惛鏀讹紙鎴栭噴鏀撅級鐨勭儹閲廞鍙互琛ㄧず涓篞=鈭紙T2,T1锛塁dT=m鈭紙T2,T1锛塩dT銆8. 鍦ㄤ竴鑸儏鍐典笅锛岀儹瀹瑰拰姣旂儹瀹归兘鏄俯搴︾殑鍑芥暟锛...
绛旓細鐢卞叕寮忥細鈻硉=Q/cm 鈻硉=1.76*10^3/(0.13*10^3*0.5)鈩 鈮27銆傗剝 璋㈣阿 鍒濅腑鐗╃悊鏈夐棶棰樺彲浠ヨ鏁欐垜
绛旓細鍥犳锛屽湪鐗╀綋娓╁害鐢盩1鍙橀潻鍒癟2鐨勬湁闄愯繘绋嬩腑锛屽惛鍙栵紙鎴栨斁鍑猴級鐨鐑噺Q=鈭紙T2,T1锛塁dT=m鈭紙T2,T1锛塩dT銆備竴鏍峰钩甯哥幆澧冧笅锛岀儹瀹逛笌姣旂儹瀹瑰潎涓烘俯搴︾殑鍑芥暟锛屼絾鍦ㄦ俯搴﹀彉闈╄寖鐣翠笉澶ぇ鏃讹紝鍙浄鍚屽湴鐪嬩负甯搁噺銆備簬鏄湁Q=C(T2-T1锛=mc(T2-T1锛夈傚浠ゆ俯搴﹀彉鍖栭噺螖T=T2-T1锛屽垯鏈塓=cm螖T銆傝繖鏄涓涓...
绛旓細鏍规嵁鑳介噺瀹堟亽瀹氱悊锛屽紑姘村拰鍐锋按閮藉埌50鎽勬皬搴︼紝鍒欏紑姘存斁鐑紝鍐锋按鍚哥儹锛屼袱鏂规墍寰楋紙澶憋級鐑噺鏄浉绛夌殑锛堢悊璁轰笂锛夛紝鍒欐湁锛歈鏀撅紳Q鍚 鍗砿C锛坱1-t)=(30-m)C(t-t2)鍗砿(100-30)=(30-m)(50-25) 娉細鈥滳鈥濇槸姘寸殑姣旂儹锛屼袱杈逛竴鏍凤紝瀵规秷锛庡嵆70m=750-25m m=10 鎵浠ラ渶瑕佸紑10鍗冨厠锛屽喎姘30锛10...
绛旓細瑙 鐢盦=cm螖t 寰 Q澹=cm螖t=0.88脳10^3 J/(kg路鈩)脳400g脳(100-20)掳=2.816脳10^4 J Q姘=cm螖t=4.2脳10^3脳2kg脳(100-20)掳=6.72脳10^5 J Q姘+Q澹=2.816脳10^4 J+6.72脳10^5=7.0016脳10^5 J 绛:......
绛旓細绾數闃荤數璺鐑噺鍜岄潪绾數闃荤數璺儹閲忛兘鍙互鐢≦=I2*R*t鏉璁＄畻锛屽嵆鏈叕寮忔槸璁＄畻鐢电儹鐨勯氱敤鍏紡锛屼笉闇鑰冭檻鏄惁绾數闃荤數璺傚綋涓虹函鐢甸樆鐢佃矾鏃讹紝Q=I2*R*t=U2/R*t=UIt锛岄兘鍙互璁＄畻鐢电儹銆傚綋涓洪潪绾數闃荤數璺紝Q=I2*R*t锛屽彧鑳界敤姝ゅ叕寮忚绠椼傛敞鎰忥細闈炵函鐢甸樆鐢佃矾涓昏鎸囩數娴佸仛鍔熶竴閮ㄥ垎杞寲涓烘満姊拌兘鐨勭數璺
