[tex]Dane:\\p = 4 \ 000 \ hPa = 400 \ 000 \ Pa = 400 \ 000 \ \frac{N}{m^{2}}\\S =a^{2} = (0,2 \ m)^{2} = 0,2 \ m \times 0,2 \ m = 0,04 \ m^{2}\\Szukane:\\F = ?\\\\Rozwiazanie\\\\p = \frac{F}{S} \ \ /\cdot S\\\\\underline{F = p\cdot S}\\\\F = 400000 \ \frac{N}{m^{2}}\cdot0,04 \ m^{2}}\\\\\boxed{F = 16 \ 000 \ N = 16 \ kN}\\\\(1 \ kN = 1000 \ N)[/tex]