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2. A steel marble at room temperature is placed
in a plastic-foam cup containing ice and water
at OC. After thermal equilibrium is reached, the
temperature of the ice-water mixture and
marble is OXC.

d. Did the internal energy of the water-ice
mixture increase or decrease? How could this be
observed?
e. Did the internal energy of the system
consisting of the water-ice mixture and the
marble increase or decrease?

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