To change the temperature of a metal part weighing 100 g from 20 ° to 40 C, 280 J of energy was required. Determine what metal the part is made of.
Task data: m (mass of the taken metal part) = 100 g (in SI m = 0.1 kg); t0 (initial temperature) = 20 ºС; t (temperature after energy transfer) = 40 ºС; Q (required heat energy) = 280 J.
The metal from which the taken part is made can be determined by its specific heat capacity: Q = C * m * (t – t0) and C = Q / (m * (t – t0)).
Calculation: C = 280 / (0.1 * (40 – 20)) = 140 J / (kg * K).
Answer: The metal part taken was made of lead.
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