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V = 2 l = 2 dm³ = 2000 cm³ bo 1 dm³ = 1000 cm³
d = 0,8 g/cm³
m = ?
d = m / V
m = d * V
m = 0,8 g/cm³* 2000 cm²
m = 1600 g = 1,6 kg
zad.2.
m = 15 kg = 15000 g
d = 0,75 g/cm³
V = ?
d = m / V
V = m/d
V = 15000 g / 0,75 g/cm³
V = 20000 cm³ = 0,02 m³ bo 1 cm = 0,000001 m²
zad.3.
a = 4 dm = 0,4 m
b = 5 dm = 0,5 m
c= 2 m
V = a * b * c
V = 0,4 m³
d = 2700 kg/m³
m = ?
d = m/ V
m = d* V
m = 2700 kg/m³ * 0,4 m³
m = 1080 kg