Odpowiedzi

2009-11-30T16:02:50+01:00
P=2kW=2000W
T=50'C
m=1,5l=1,5kg
c=4200 J/kg*'C

W=Q
P/t=mcT/:P
t=mcT/P
t=1,5kg*4200J/kg* C *50 C/2000W
t=157,5s
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