1. An automobile cooling system holds 16 L of water. How much heat does it absorb if its temperature rises from 20 C to 80 C?
2. A 5.0 kg lead ball is dropped into a 2.0 L insulated pail of water initially at 20.0 C. If the final temperature of the water-lead combination is 27.0 CC, what was the initial temperature of the lead ball?

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