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T₁ = 1200 K
T₂ = 400 K
Q₁ . . . ?
Q2 / Q1 = T2 / T1
Q2 / Q1 = 400 / 1200 = 1/3
Q2 = 1/3 Q1
W = Q1 - Q2
Q1 = W + Q2
Q1 = 2000 + Q2 = 2000 + 1/3
Q1 = 2Q1 / 3 = 2000
Q1 = 3000 J