# What amount of heat was used to heat a cast-iron bar weighing 32 kg and having a temperature of 15

What amount of heat was used to heat a cast-iron bar weighing 32 kg and having a temperature of 15 ° C to a temperature of 1115 ° C?

Initial data: m (mass of the taken blank) = 32 kg; t1 (temperature of the cast iron bar before heating) = 15 ºС; t2 (final heating temperature of the cast iron bar) = 1115 ºС.

Reference data: Сч (specific heat capacity of cast iron) = 540 J / (kg * ºС).

The amount of heat that went into heating the cast iron ingot was determined by the formula: Q = Cch * m * (t2 – t1).

Calculation: Q = 540 * 32 * (1115 – 15) ≈ 19 * 106 J = 19 MJ.

Answer: 19 MJ of heat was used to heat the cast-iron ingot.

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