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    1. 40kg steel casting initially at 420◦C was closed in the container which contains 130kg of oil initially at 21◦C. During cooling process, heat equaled to 20% of the change of internal energy of steel casting flowed away from the container to the surroundings at 21◦C. Calculate: a) entropy generated during cooling process to the moment when the temperatures of steel cast and oil are the same; b) entropy generated if cooling process is continued until the system attains equilibrium state with the surroundings. Specific heats of steel and oil are equaled to: 0.5 and 2.5KJ/(kgK), respectively.
 
 
 

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