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m₁ = 200 g = 0,2 kg
m₂ = 300 g = 0,3 kg
Δt₁ = (80-x) °C
Δt₂ = (x-20) °C
c air = 2100 J/kg°C
ditanya : x = ... °C
jawab :
Q lepas = Q terima
m₁ . c . Δt₁ = m₂ . c . Δt₂ (karena c nya sama, tinggal di coret)
m₁ . Δt₁ = m₂ . Δt₂
0,2 kg . (80-x)°C = 0,3 kg . (x-20)°C
16 - 0,2x = 0,3x - 6
16 + 6 = 0,3x + 0,2x
22°C = 0,5x
44°C = x