[tex]dane:\\S_2 = 800 \ cm^{2}\\m_2 = 1920 \ kg\\S_1 = 40 \ cm^{2}\\g = 10\frac{N}{kg}\\szukane:\\F_1 = ?\\\\F_2 = m_2\cdot g = 1920 \ kg\cdot10\frac{N}{kg} = 19 \ 200 \ N\\\\\frac{F_1}{S_1} = \frac{F_2}{S_2}\\\\F_1\cdot S_2=F_2\cdot S_1 \ \ /:S_2\\\\F_1 = F_2\cdot\frac{S_1}{S_2}\\\\F_1 = 19200 \ N\cdot\frac{40 \ cm^{2}}{800 \ cm^{2}}\\\\F_1 = 960 \ N[/tex]
