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Dane:
P = 2 kW = 2000 W
t = 20 min = 1200 s
Rozw.
P = W/t
W = Pt = 2000 W × 1200 s =2400000J
Zad2
Dane
P = 2 kW = 2000 W
t = 5 min = 300s
Rozw.:
P = W/t
W = Pt = 2000 W × 300 s = 600000 J
P=2kW=2000W
t=20min=20*60s=1200s
W=P*t=2000W*1200s=2400000Ws=2400000J=2,4MJ M - mega
2.
P=2kW=2000W
t=5min=5*60s=300s
W=P*t=2000W*300s=600000Ws=600000J=0,6MJ