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4- A 50.0 g sample of copper is at 25.0°C. If 1200 J of energy is added to it by heat, what is the final temperature of the copper?




7- A 1.50-kg iron horseshoe initially at 600°C is dropped into a bucket containing 20.0 kg of water at 25.0°C. What is the final temperature? (Ignore the heat capacity of the container, and assume that a negligible amount of water boils away.)




30-A gas is taken through the cyclic process described in Figure (a) Find the net energy transferred to the system by heat during one complete cycle. (b) What If? If the cycle is reversed—that is, the process follows the path
ACBA—what is the net energy input per cycle by heat?

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