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dane: T2= 400K, Q1=k*W
szukane: T1
[T1 - T2]/T1 = [Q1 - Q2]/Q1 Q1= k*W= k[Q1 - Q2] czyli [Q1 - Q2]= Q1/k
[T1 - T2]/T1 = 1/k = 1/5
T1 = 5T2/4 = 5*400K/4 = 500K
T1 = 500K
................pozdrawiam