Pounding a nail into wood makes the nail warmner. Consider a 4 gram steel nail 9 cm long, and a hammer that exerts an average force of 500 N on it when it is being driven into a piece of wood. The nail becomes hotter. Calculate the increase in the nail's temperatue. (Assume the specific heat capacity of steel is 450 J/kg °C.)

## This question was asked on May 15, 2010.

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