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t1=20°C
t2=100°C
Cw=4200J/kg×°C
szukane
Q
rozwiazanie:
Q=m×Δt×Cw Δt=t2-t1
Q=2kg×80°C×4200J/kg×°C Δt=80°C
Q=672000J=672kJ
ΔT=100⁰C-20⁰C=80⁰C
c=4200J/kg×⁰C
Q= cmΔT
Q= 4200J/kg×⁰C × 80⁰C × 2 kg= 672000J=672kJ
odp. Należy dostarczyć 672kJ ciepła.