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Q= w/eta
Q = 150000 / 0,4 = 375 000
2.
SPRAWNOSC
ETA= Q1 - Q2 / Q1
16000 - 12000/ 16000 = 25 %
PRACA
eta = W / Q
eta * Q = W
0,25 * 16000 = 4000
w = 4000