In an aquarium 50 cm long and 20 cm wide, water is poured up to a height of 25 cm.
June 21, 2021 | education
| a = 50 cm = 0.5 m.
b = 20 cm = 0.2 m.
h = 25 cm = 0.25 m.
ρ = 1000 kg / m3.
m -?
The density of a substance ρ is a scalar physical quantity equal to the ratio of the mass of a substance m to the volume V it occupies: ρ = m / V.
We express the mass of water m by the formula: m = ρ * V.
Since the aquarium has the shape of a rectangular parallelepiped with edges a * b * h, we will express its volume V by the formula: V = a * b * h.
m = ρ * a * b * h.
m = 1000 kg / m3 * 0.5 m * 0.2 m * 0.25 m = 25 kg.
Answer: the aquarium contains m = 25 kg of water.
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