I活塞有摩擦,导热, 解:2)QA,WA PA=yUA +WA=MARTA InA=pAvA A 20.43 2B=AUB+WB-PBBIn -=-9.417 B >摩擦耗功=W-WM=107 3)Q A+B QAB=△yA+B+v+B=0II. 活塞有摩擦,导热, T 解:2) QA,WA Q U W A A A = + A A A A ' ln V m RT V = Q U W B B B = + = 20.43J A A A A ' ln V p V V = B B B B ' lnV p V V = = −9.41J W W A B 摩擦耗功 W W W J 摩 =−= A B 11.02 Q U W A+B A+B A+B = + 3) QA+B = 0