Odpowiedzi

2010-02-04T17:39:01+01:00
P = 2 kw = 2000 W
t= 20 minut = 20 *60 = 1200 s
W = p * t

W = 2000 W * 1200 s = 2400000 J
2 5 2
2010-02-04T17:41:43+01:00
P=2kw=2000w
t=20min=1200s
P=w/t
W=P*t
W=2000w*1200s
W=2400000J=2400kJ=2,4mJ
1 5 1