1. A gas enclosed in a cylinder occupies 0.030 m3. It is compressed under a constant pressure of 3.5 x 10^5 Pa until it's final volume is exactly one-third of its initial volume. A. What was the change in the gas volume?
B. How much work was done?
C. The gas was lost 5.0 x 10^3 J as heat during the compression process. Did the internal energy of the gas increase or decrease? By how much?

2. A steel marble at room temperature is placed in a plastic-foam cup containing ice and water at 0°C . After thermal equilibrium is reached, the temperature of the ice-water mixture and marble is 0°C.

A. Was energy transferred between the marble and the water as heat? Which object lost energy?
B. Was any work done on the marble or by the marble?
C. Did the internal energy of the marble increase or decrease ? What was a measurable effect of this change?
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?