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m=0,5 kg
Δt=?
ΔE=5 kJ=5 000J
Cw=4200J/kg*⁰C
ΔE=m*Cw*Δt
Δt=ΔE/m*Cw
Δt=5 000J/(0,5 kg *4200J/kg*⁰C)
Δt=50/21 ⁰C
Δt≈2,4 ⁰C