example 1-2 - Example 1-2 A paddlewheel is used to stir a...

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Example 1-2 A paddlewheel is used to stir a liquid mixture in a tank. Over a period of time, the paddlewheel does 42 kJ of work on the liquid, while 115 Btu of heat are transferred from the liquid to the environment. The liquid has a total mass of 2.6 kg and a specific heat nearly equal to that of water. If the liquid is initially at 50°C, calculate the final liquid temperature. Assume constant specific heat. Solution: Choose the liquid to be the closed system under study. Exclude the paddlewheel and the walls of the tank. From the first law KE PE U Q W + ∆ + ∆ = which reduces to
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