m=2kg
cw=4200 J/kg razy stopien C
ΔT=Tk-To=100-20=80 stopni
P=0,8kW=800W
Qstracone= 25% Q
t????
Q= m razy cw x ΔT
Q= 2 razy 4200 razy 80= 672000 J
Q calkowite = Q + Q stracone= Q+25% Q= 125% Q=1,25 razy Q
Q calkowite= 1,25 x 672000= 840000J
P=Qcalkowite:t
Pt= Q calkowite
t= Q calkowite:P= 840000:800= 1050 s= 17 mint 30 sekund
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m=2kg
cw=4200 J/kg razy stopien C
ΔT=Tk-To=100-20=80 stopni
P=0,8kW=800W
Qstracone= 25% Q
t????
Q= m razy cw x ΔT
Q= 2 razy 4200 razy 80= 672000 J
Q calkowite = Q + Q stracone= Q+25% Q= 125% Q=1,25 razy Q
Q calkowite= 1,25 x 672000= 840000J
P=Qcalkowite:t
Pt= Q calkowite
t= Q calkowite:P= 840000:800= 1050 s= 17 mint 30 sekund