The cast iron ball has a mass of 4.2 kg with a volume of 700 cm3. Find the volume of the cavity in the ball.

Initial data: m (weight of the cast iron ball) = 4.2 kg; V (full volume of the cast iron ball) = 700 cm ^ 3.

Reference data: ρ (density of cast iron) = 7000 kg / m ^ 3.

1) Calculate the volume of cast iron in a given ball: V1 = m / ρ = 4.2 / 7000 = 0.0006 m ^ 3.

V1 = 0.0006 m ^ 3 = 0.0006 * 10 ^ 6 cm ^ 3 = 600 cm ^ 3.

2) Determine the volume of the cavity in the cast iron ball:

V2 = V – V1 = 700 – 600 = 100 cm ^ 3.

Answer: The volume of the cavity in the cast iron ball is 100 cm ^ 3.