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A 59-kg iron block and a 20-kg copper block, both initially at 80°C, are dropped into...

A 59-kg iron block and a 20-kg copper block, both initially at 80°C, are dropped into a large lake at 15°C. Thermal equilibrium is established after a while as a result of heat transfer between the blocks and the lake water. Assuming the surroundings to be at 20°C, determine the amount of work that could have been produced if the entire process were executed in a reversible manner. The specific heats of iron and copper are 0.45 kJ/kg·K and 0.386 kJ/kg·K, respectively. The amount of work that could have been produced is

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