Odpowiedzi

2010-02-04T18:00:27+01:00
1.
W= 0,48MJ=480kJ
P= 2,5 kW
t =20min= 20*60s= 1200s
W =P*t
Ws =2,5 kW*1200s
Ws =3000kWs =3000kJ
x =480kJ/3000kJ *100%
x =48000/3000%
x =16 %


Pozdrawiam sebastianek;√