Consider the energy balance equation for a closed system. U+Ek+Ep=Q+W Given the scenarios and systems described, identify the energy balance equation terms according to whether they are less than zero, zero, or greater than zero. Scenario 1: You put a jar of pickles, initially at room temperature, into the refrigerator, and the jar contents cool to 38F. Consider the system to be the jar contents, and assume that the shelf in the refrigerator is at the same height as the counter on which the jar was initially resting. Scenario 2: The same pickle jar falls off of the shelf and is about to hit the floor. Consider the pickle jar to be the system, and for there to be negligible heat transfer or temperature change during this process. Scenario 3: On a cold day, water rests in a small crack in an asphalt road. As night falls, the ice freezes, expands, and causes the crack to grow into a pothole. Consider the system to be the water