drewniana kulka wrzucona do wody plywa zanurzona do polowy gestosc drewna wynosi a) 250 g/dm do 3 b) 500 g/dm do 3 c) 1000 g/dm do 3 d) 2000 g/dm do 3

[latex]dane:\Vzanurzone = frac{1}{2}V\dw = 1000kg/m^{3}\g = 10m/s^{2}\szukane:\dd= ?[/latex] [latex]F = d * g * Vzanurz.[/latex] [latex]F = dw * g * frac{1}{2}V\i\F = m * g = dd * g * V[/latex] [latex]dd * V * g = dw * g * frac{1}{2}V\dd = frac{1}{2}V[/latex] [latex]dd = frac{1}{2} * 1000kg/m^{3}[/latex] [latex]dd = 500kg/m^{3} = 0,5g/cm^{3}[/latex]