17. dane: m = 3 kg S = 60 cm² = 0,006 m² g = 10 m/s² = 10 N/kg szukane: p = ? p = F/S ale: F = m * g = 3kg * 10N/kg = 30 N p = 30N/0,006m² p = 5 000 Pa 18. dane: V = 250 dm³ = 0,25 m³ d = 810 kg/m³ szukane: m = ? d = m/V |*V m = V * d = 0,25m³ * 810kg/m³ m = 202,5 kg 19. dane: dw = 1 g/cm³ do = 0,92 g/cm³ szukane: dw/do = ? d = m/V |*V m = V * d [latex]frac{m_{w}}{m_{o}} = frac{d_{w}*V}{d_{o}*V} = frac{d_{w}}{d_{o}} = frac{1frac{g}{cm^{3}}}{0,92frac{g}{cm^{3}}}= 1,09\\frac{m_{w}}{m_{o}} approx 1,1\\m_{w} approx 1,1m_{o}[/latex]
