1.A 10-kg bar of cast iron initially at 400°C is quenched in a 200- water tank initially at 25°C….

1.A 10-kg bar of cast iron initially at 400°C is quenched in a 200- water tank initially at 25°C. Assuming no heat transfer with the surroundings and no boiling away of liquid water, calculate the net entropy change for the process.

2.A 10-lbm bar of cast iron initially at 700 F is quenched in a 5-ft3 water tank initially at 60 F. Assuming no heat transfer with the surroundings and no boiling away of liquid water, calculate the net entropy change for the process.

 

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