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in Physics by (63.3k points)
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A mass of 3 kg nitrogen gas at 2000 K, V = C, cools with 500 W. What is dT/dt?

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Process:  V = C  1W= 0

Remark: Specific heat has Cv 300 = 0.745 kJ/kg K which is nearly 25% lower and thus would over-estimate the rate with 25%.

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