2. The following are examples of simple first law problems. (a) An isolated system initially consists...

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2. The following are examples of simple first law problems. (a) An isolated system initially consists of two containers of 1 kg each of water. The first container is initially at 100C and the second is at 0C. The two are in thermal contact, so heat can move from one to the other. After some time, both arrive at the same temperature. What is the change in energy content for the entire system? (b) A drill is drilling a hole in a piece of iron. The process is at steady state. The electric power to the drill is 1000 W. 800 W of heat is transferred from the iron to the environment. The drill is hot, so it also transfers heat to the environment. How much (W)? (c) A 0.1 m diameter balloon contains air at 100 kPa pressure and 300 K. Heat is added to the balloon such that it expands at constant pressure to 0.12 m diameter. Find the amount of work the balloon has done on the environment (kJ) 2. The following are examples of simple first law problems. (a) An isolated system initially consists of two containers of 1 kg each of water. The first container is initially at 100C and the second is at 0C. The two are in thermal contact, so heat can move from one to the other. After some time, both arrive at the same temperature. What is the change in energy content for the entire system? (b) A drill is drilling a hole in a piece of iron. The process is at steady state. The electric power to the drill is 1000 W. 800 W of heat is transferred from the iron to the environment. The drill is hot, so it also transfers heat to the environment. How much (W)? (c) A 0.1 m diameter balloon contains air at 100 kPa pressure and 300 K. Heat is added to the balloon such that it expands at constant pressure to 0.12 m diameter. Find the amount of work the balloon has done on the environment (kJ)

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