12/6/10 1 Physics 121 played by Ruth Laredo12/6/10 3 Physics 12112/6/10 4 Physics 12112/6/10 6 Physics 121 222111TcmTcm =12/6/10 7 Physics 121 TCQ =mcC =12/6/10 8 Physics 12112/6/10 9 Physics 121 Q = m1c1T1= m1c1(Tf T1i)Q = m2c2T2= m2c2(Tf T2i)m1c1(Tf T1i) = m2c2(Tf T2i)m1c1(Tf T1) = m2c2(T2 Tf)Tf=m1c1T1+ m2c2T2m1c1+ m2c2Tf=m1c1m1c1+ m2c2 T1+m2c2m1c1+ m2c2 T212/6/10 10 Physics 121 Q =±mcT12/6/10 11 Physics 12112/6/10 12 Physics 12112/6/10 13 Physics 12112/6/10 14 Physics 12112/6/10 15 Physics 121 T = ZZ =LA12/6/10 16 Physics 121 =Ak =1 T = Z =LA =Lk A T = R Thermal conductance Heat flow per unit area Thermal resistance (R-value)Material k (W/m-C) Material k (W/m-C) Steel 12-45 Wood 0.4 Aluminum 200 Insulation 0.04 Copper 380 Air 0.025 12/6/10 17 Physics
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