We placed a lead object weighing 0.4 kg and 250°C in 0.4 L water. What was the initial temperature of water t2 if the object's temperature and the water after reaching equilibrium was 35°C? We assume that the heat exchange occurred only between the lead object and water. The mass heat capacity of lead is 130 J/kg / °C. The mass heat capacity of water is 4200 J/kg / °C.
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