perfectly insulated room has temperature 72o. the source of climate control is turned off. But a refrigerator is put into the room and plugged in. The adjustment inside the refrigerator is turned to “maximum cold” and the door to the refrigerator affects the temperature in the room. After one hour, is the room hotter or colder than the original 72o.

The lid of a pressure cooker forms a nearly airtight seal. steam builds up pressure and increases temperature within the pressure cooker so that food cooks faster than it does in an ordinary pot. the system is defined as the pressure cooker and the water and steam within it. if 2.0 g of water is sealed in a pressure cooker and then vaporized by heating, and 5655 j must be added as heat to completely vaporize the water, what is the change in the system’s internal energy? answer in units of j.