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m=O,5kg
TEM=100-20=80(stopni)
Cw=4200J
t=??
ob;iczam prace-Q=m*CW*(Delta)t
Q=0,5*4200*80=168000J
Q=w w=168000J
P=W/t po przekształceniu-
t=w/p
t=168000J/2000W=84s