Determine the mass of an iron beam 1 m long if the cross-section of the beam is a square with a side of 2 cm.

Problem data: L (length of the taken iron beam) = 1 m; section of the beam – square; a (side length) = 2 cm (in SI a = 0.02 m).

Constants: ρzh (iron density) = 7800 kg / m3.

To determine the mass of the taken iron beam, we use the formula: m = ρzh * V = ρzh * L * a ^ 2.

Let’s calculate: m = 7800 * 1 * 0.02 ^ 2 = 3.12 kg.

Answer: The taken iron beam has a mass of 3.12 kg.