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b=2[m]
c=1m] wymiary orostopadloscianu
g=1,3[g/cm³] gestosc piasku
g=1 300 [kg/m³]
V=(3/4)abc objetosc piasku
m=gV masa piasku
m=0,75*3*2*1300
m=5850 [kg] jednostka [m³*(kg/m³)]=[kg]
Piasek wazy 5 850[kg]