What is the density of a metal ball with a volume of 20 cm² if it is attracted to the Earth with a force of 1.6 N?

Initial data: V (volume of a metal ball) = 20 cm3 (20 * 10-6 m3); F (the force of attraction of the metal ball to the Earth) = Ft (gravity) = 1.6 N.

Reference values: g (acceleration due to gravity) ≈ 10 m / s2.

1) Calculate the mass of the metal ball: F = m * g and m = F / g = 1.6 / 10 = 0.16 kg.

2) Determine the density of the metal ball: ρ = m / V = 0.16 / (20 * 10-6) = 8000 kg / m3.

Answer: The density of a metal ball is 8000 kg / m3.