A carpenter is driving a 15.0-g steel nail into a board.His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail.Half of the kinetic energy of the hammer is converted into internal energyin the nail and does not flow out of the nail.What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg ∙ K.

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Quizplus · Accepted Answer

The correct answer is A.The kinetic energy of the hammer is 1/2 * 1.00 kg * (8.50 m/s)^2 = 36.1 J. Half of this energy is converted into internal energy in the nail, so the increase in temperature of the nail is:ΔT = (36.1 J / 2) / (15.0 g * 448 J/kg ∙ K) = 8.1 K

A Carpenter Is Driving a 15