Determine from what substance a part with a mass of 4 kg and a volume of 1000 cm ^ 3 is made.

To determine the material of the part, we first calculate its density of the piece using the formula:
ρ = m / V, where ρ is the density of the part (kg / m³), m is the mass of the part (m = 4 kg), V is the volume of a piece of the part (V = 1000 cm³ = 10-³ m³).
Let’s calculate the density of the part:
ρ = m / V = 4/10-³ = 4000 kg / m³.
From the table of material densities, we determine that the part is made of corundum
Answer: The part is made of corundum.