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A blacksmith heated 2 kg of iron piece to 120°C in the furnace and took it out of the fire for hammering into thin sheet. The iron piece cooled down to 30°C during the process of hammering. What was the amount of heat lost by the iron? Take specific heat capacity of iron as 450 J/kg°C.



Answer :

Answer:

Explanation:

Using dimensional analysis :

  kg  *    J / (kg C)    *  C  =   J  

Now put in the numbers:

 2 kg   *   450 J/ (kg C)  *  ( 120 - 30) C = 81 000 J

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