Odpowiedź:
m1=3kg
m2=10kg
T1=0°
T2=70°
cw=4200J/kg*°C
ct=335000J/kg
Qpob=m*ct
Qpob=3kg*335000J/kg
Qpob=1005000J
Qodd=m*cw*ΔT
ΔT=Qodd/m*cw
Qpob=Qodd
ΔT=1005000J/10kg*4200J/kg*°C
ΔT≈24°C
T3=T2-ΔT
T3=70°C-24°C=46°C
Q1=cw*m1*(T-T1)
Q2=cw*m2*(T3-T)
Q1=Q2
cw*m1*(T-T1)=cw*m2*(T3-T)
T=(m2*T3+m1*T1)/(m1+m2)
T=(10kg*46°+3kg*0°)/10kg+3kg
T=35,38°C
