1. Consider Joule s paddle wheel apparatus described in Section 13.1. Joule claimed that a weight of 817 pounds falling 1 foot was the energy equivalent needed to raise the temperature of 1 pound of water by1? (a)Whats the percentage difference between those two supposedly equivalent values? (b)What should have been the weight, in pounds? 2. Consider again Joule s apparatus from the preceding problem. If you wanted to state similar results in SI units, what mass of water falling 1 m would produce the energy needed to raise the temperature of 1 kg of water by 1 K?
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