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1. m a calorimeter, a 140-gram aluminum container is initially at 18.0 oc. 150 grams of water at 90.0 oC is added to the container. What is the final temperature of the water and the container when the system reaches equilibrium? (specific heat of water = 4186 J/kg oC, specific heat of aluminum = 900 K/kg. oC)

2. An engine goes through a cyclic process. In the process, the engine does 700 J of work and has a heat output of 2200 J. What is the efficiency of the engine?

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