Task data: m (mass of steel to be melted) = 2 kg; t (initial steel temperature) = 1500 ºС (we will assume that melting will begin at this temperature).
Reference values: λ (specific heat of fusion of steel) = 0.84 * 10 ^ 5 J / kg.
The consumed thermal energy for melting 2 kg of steel is calculated by the formula: Q = λ * m.
Calculation: Q = 0.84 * 10 ^ 5 * 2 = 1.68 * 10 ^ 5 J = 168 kJ.
Answer: It takes 168 kJ of energy to melt 2 kg of steel.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.