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210000=1×4200×(x-30)
210000=4200×(x-30)
x-30 =210000/4200
x-30 =50
x =50+30
x =80
Jadi, suhu air menjadi 80 derajat
dit = t₂?
Q = m.C.Δt
210000j = 1kg . 4200 j/kg°C. (t₂-30°C)
(t₂-30°C) = 210000j / 1kg.4200j/kg°C
(t₂-30°C) = 50°C
t₂ = 50 + 30
t₂ = 80°C