When heating a metal bar weighing 250 g from 15 to 115 degrees C, 9500 J of heat was expended.
| September 6, 2021 | education
When heating a metal bar weighing 250 g from 15 to 115 degrees C, 9500 J of heat was expended. Solve the problem and determine the substance from which the bar was made.
Initial data: m (mass of a metal bar) = 250 g (0.25 kg); t1 (initial temperature of the bar) = 15 ºС; t2 (final temperature) = 115 ºС; Q (consumed amount of heat for heating) = 9500 J.
The substance from which the metal bar is made is determined by the value of its specific heat capacity: Q = C * m * (t2 – t1); C = Q / (m * (t2 – t1)).
Calculation: C = 9500 / (0.25 * (115 – 15)) = 9500/25 = 380 J / (kg * ºС).
Answer: The metal bar is made of tinned bronze.
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