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Q=Vcs; V=7,5 l; cs=32*10^6 J/l
Praca silnika
W=Pt; P=20*10^3 W; t=1h=3600 s
sprawność silnika
η=W/Q=Pt/Vcs= 20*10^3*3600/7,5*32*10^6=0,3
η=30 %