An iron block of unknown mass at 185°F is dropped into an insulated tank that contains 0.8 ft3of water at70°F. At the same time, a paddle wheel driven by a 200-W motor is activated to stir the water. Thermal equilibrium is established after 10 min with a final temperature of 75°F. Determine (a) the mass of the iron block and (b) the entropy generated during this process.
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