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dane: Q=2,54N, Q'=2,24N, dw=1g/cm3 = 1kg/dm3
szukane: dx
dx = m/V m = Q/g Q - Q' = Fwyp = dw*g*V
V = [Q - Q']/dw*g
dx = [ Q/g] *dw*g/[Q - Q'] = 2,54N*1kg/dm3/[2,54N - 2,24N] = 8,47kg/dm3
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