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T₂ = 300⁰K
Q₁ = 24 kJ = 24000 J
W = ...................?
Penyeleaian :
W = Q₁ (1 - T₂/T₁)
W = 24000 (1 - 300/800)
W = 24000 (1 - 0,375)
W = 24000 x 0,625
W = 15000 Joule
W = 15 kJ
Jadi, usaha yang dilakukan adalah 15 kJ