1000 cc's (1kg) of water at 21 degrees C is placed directly on top of 1 kg of aluminum, which has a temp of -10 degrees C. The water is contained so that it doesn't spill by a rectangular box with the bottom cut out so that contact is made directly with the Al. How much does it take for the two materials (water and Al) to reach thermoequilibrium, and what is final temperature of the combined mass of Al and the water. Assume that the materials are completely insulated and that the only heat transfer is between the Al mass and the water mass. So again, the question is, how long does is take (in seconds) for the water and Al to reach the same temperature (thermoequilibrium) and what is that temperature?