1.) Why must a room air conditioner be placed in a window rather than just set on the floor and plugged in? Why can a refrigerator be set on the floor and plugged in? 2.) Does a refrigerator full of food consume more power if the room temperature is 200C than if it is 150C? Or is the power consumption the same? Explain your reasoning. 3.) What would be the efficiency of a Carnot engine operating with TH = TC? What would be the efficiency if TC = 0 K and TH were any temperature above 0 K? Interpret your answers.

1.) Why must a room air conditioner be placed in a window rather than just set on the floor and plugged in? Why can a refrigerator be set on the floor and plugged in? 2.) Does a refrigerator full of food consume more power if the room temperature is 200C than if it is 150C? Or is the power consumption the same? Explain your reasoning. 3.) What would be the efficiency of a Carnot engine operating with TH = TC? What would be the efficiency if TC = 0 K and TH were any temperature above 0 K? Interpret your answers.