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V = 100 m³
d = 0,18 kg/m³ - gstoś helu
szukane:
m = ?
Korzystamy z wzoru na gęstość substabcji
d = m/V |*V
m = V × d
m = 100m³ × 0,18kg/m³
m = 18 kg
Odp. Szukana masa wynosi 18 kg.