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A perfectly insulated cubical tank 0.8 m on each side contains liquid water at 18 C....

A perfectly insulated cubical tank 0.8 m on each side contains liquid water at 18 C. A cube of copper 0.2 m on each side with a temperature of 90 C is quickly plunged into the water displacing an amount of water equal to the volume of the copper block. A perfectly insulated lid is quickly placed on the top of the tank. Determine the final temperature of the block and the water after a long period of time.

engineering   Mechanical-Engineering   
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