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m = 4 kg
c = 460 J/kg°C
t₁ = 20°C
t₂ = 70°C
Δt = t₂-t₁
Δt = 50
Dit = Q
Jwb =
Q = m.c.Δt
Q = 4.460.50
Q = 92000 J
Q = 92 kJ