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dane:
E = 4kJ
W = 3,6 kJ
szukane:
Q, n(sprawność)
E = W + Q
Q = E - W = 4kJ - 3,6kJ = 0,4kJ
n = W*100% / E = 3,6kJ *100% / 4kJ = 90%
Stracono 0,4 kJ w postaci ciepła, a sprawność wynosi 90%.
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