A steel part weighing 500 g was heated by 20 ° C when machined on a lathe. how much heat is needed for this?

univerkov | June 19, 2021 | education

Initial data: m (mass of the processed steel part) = 500 g (0.5 kg); Δt (change in the temperature of the part during processing on the machine) = 20 ºС.

Reference data: С (specific heat capacity of steel) = 500 J / (kg * ºС).

The amount of heat that was required to change the temperature of the steel part is calculated by the formula: Q = C * m * Δt.

Calculation: Q = 500 * 0.5 * 20 = 5000 J (5 kJ).

Answer: To heat a steel part, you need 5 kJ of heat.

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