How much heat is needed to melt 50 kg of steel at the melting temperature.

Problem data: m (mass of steel to be remelted) = 50 kg; taken steel is at the melting temperature.

Constants: λ (specific heat of melting of steel) = 0.84 * 10 ^ 5 J / kg.

We calculate the required heat for remelting 50 kg of steel by the formula: Q = λ * m.

Let’s calculate: Q = 0.84 * 10 ^ 5 * 50 = 4.2 * 10 ^ 6 J (4.2 MJ).

Answer: To melt 50 kg of steel, you need to spend 4.2 MJ of heat.

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