What amount of heat must be spent to melt a body weighing 5 kg at a specific heat of fusion of 3 * 10 / 5J / kg.

Initial data: m (body weight) = 5 kg; we consider that the temperature of the taken body is equal to the temperature of the beginning of its melting.

Reference data: λ (specific heat of melting of the body) = 3 * 10 ^ 5 J / kg.

The consumption of thermal energy for melting the body is determined by the formula: Q = λ * m.

Calculation: Q = 3 * 10 ^ 5 * 5 = 15 * 10 ^ 5 J = 1.5 MJ.

Answer: To melt the taken body, it is necessary to expend 1.5 MJ of heat.