Find the mass of a steel door that is 1.5 x 2 m squared and 2 cm thick.

Initial data: a (length of the steel door) = 2 m; b (steel door width) = 1.5 m; s (steel door thickness) = 2 cm = 0.02 m.

Reference data: ρ (density of steel) = 7800 kg / m ^ 3.

1) Calculate the volume of the steel door: V = a * b * s = 2 * 1.5 * 0.02 = 0.06 m ^ 3.

2) Determine the mass of the steel door: m = ρ * V = 7800 * 0.06 = 468 kg.

Answer: A steel door with the given dimensions has a mass of 468 kilograms.