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Q = m c (t - t₀)
84000 = 0,5 x 4200 (t - 293)
t - 293 = 84000 / 2100
t = 40 + 293 = 333 K = 60°C
2. m = 2 kg Δt = 50°C = 323 K c= 4200 J/(kg.K)
Q = m c Δt
= 2 x 4200 x 323 = 2713200 J