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m - masa
V - objętość
d = m/v ----> V = m/d
zad 1
m = 31,2kg
d = 7874kg/m³
V = 31,2kg : 7874km/m³ = 0,039624079m³
1m³ = 1000000cm³ = 1000dm³
0,039624079m³ ≈ 3962,4cm³ ≈ 4dm³
zad 2
V = 500cm³
m = 1.5kg = 1500g
d= 1500g : 500cm³ = 3g/cm³
p * v = m | : p
v = m/p
v = 31,2kg / 7875 kg/m^3
v = około 0,004 m^3 = około 4 dm^3
p=m/v
p=1,5kg/500cm^3
p=0,003kg/cm^3 * 1000g = 3g/cm^3