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V₁ = 2,5 L
T₁ = 27⁰C = 300K
T₂ = 87⁰C = 360⁰K
P = 2 x 10⁵ Pa
W = ...........?
Penyelesaian
* Mencari V₂
V₁/T₁ = V₂/T₂
2,5/300 = V₂/360
V₂ = (2,5 x 360)/300
V₂ = 3 Liter
* Mencari Usaha
W = P (V₂ - V₁)
W = 2 x 10⁵ (3 - 2,5)
W = 2 x 10⁵ (0,5)
W = 10⁵ Joule
Jadi, besar usaha yang dilakukan adalah 10⁵ Joule