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 air that we breath is made mostly of which gaseous molecule

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •  

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above