There is a bottle with a mass of 0.24 kg. When it is filled with water, the total mass is 1.44 kg. When it is filled with certain oil, the total mass is 1.2 kg

There is a bottle with a mass of 0.24 kg. When it is filled with water, the total mass is 1.44 kg. When it is filled with certain oil, the total mass is 1.2 kg

It is known that M bottle = 0.24kg, m water + m bottle = 1.44kg, m oil + m bottle = 1.2kg
∵ m bottle = 0.24kg, m water + m bottle = 1.44kg
Ψ m water = 1.44kg-0.24kg = 1kg
∵ ρ = m / V ∵ v = m / ρ water = 1kg ^ (1.0 * 10 ^ 3kg / m ^ 3) = 1.0 * 10 ^ - 3 (m ^ 3)
∵ the volume of the bottle remains unchanged ∵ V oil = V water = 1.0 * 10 ^ - 3 m ^ 3
∵ ρ = m / V ∵ ρ oil = (1.2kg-0.24kg) / (1.0 * 10 ^ - 3 m ^ 3)
=9.6*10^2(kg/m^3)

There is a glass bottle in the laboratory. The mass of the bottle is 10g. When it is filled with water, the mass of the water and the bottle is 20g. When it is filled with oil, the mass of the oil and the bottle is 18G. Calculate the density of the oil

Water mass: mwater = 20g-10g = 10g bottle volume: v = mwater ρ water = 10g1g / cm3 = 10cm3 oil mass: meoil = 18g-10g = 8g oil density: ρ oil = meoil V oil = 8g10cm3 = 0.8 × 103kg / m3 answer: oil density is 0.8 × 103kg / m3

The density of edible oil is 0.85 × 1000 kg / m3, and the mass of edible oil in 5-liter bottle is () kg,
32 kg edible oil needs () such bottles to fill?

The quality of edible oil in 5-liter bottle is as follows:
m=ρV=0.85×10^3×5×10^-3=4.25㎏
The number of bottles needed for 32 kg edible oil is as follows:
N = 32 / 4.25 ≈ 7.5 is 8 bottles