Find the volume of a body immersed in kerosene if the displacement weight of the liquid is 20 Newtons.

A buoyant force equal to the weight of the displaced fluid acts on a body immersed in a liquid, and is called the Archimedes force:
Fа = ρж * g * V, where ρж is the density of the liquid, g is the acceleration of free fall of a body raised above the Earth g = 9.8 m / s², V is the volume of the body.
According to the reference book, the density of kerosene is ρzh = 800 kg / m³.
Let us express the volume from this expression:
V = Fа / (ρж * g)
Substitute the numerical values and find the volume of the body:
V = 20 / (800 * 9.8) = 0.0025 m³
Answer: the volume of a body immersed in a liquid is 0.0025 m³ or 2.5 liters.