Question

In an experiment to determine the density of an unknown
material, its apparent weight when fully submerged in water is
measured. The apparent weight in water is 17.5 N and the weight
in air is 27.5 N. What is the density of the material?

Answer 1

To find the density of the material,

we use the below equation

Where ρ_f is the density of fluid

ρ_obj is the desnity of object.

From the given data

Actual weight = 27.5 N

apparent weight = 17.5 N

Density of fluid = Density of water ρ_f = 1000 kg/m³

substituting in the above equation we get,

27.5-17.5 / 27.5 = 1000/ ρ_obj

_=> ρ_obj = 2750 kg/m³