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c= 400 J/kg°C
Q= 4 Kj= 4000 J
t₁=20°C
t₂= 70°C
Δt= t₂-t₁
Δt= 50°C
Dit= m
Jwb=
Q= m.c.Δt
4000=m.400.50
4000= m.20000
m= 0,2 kg