Engineering Thermodynamics
An open system is one in which

Mass does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy
Neither mass nor energy crosses the boundaries of the system
Both energy and mass cross the boundaries of the system

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Engineering Thermodynamics
The door of a running refrigerator inside a room was left open. Which of the following statements is correct?

The room will be cooled very slightly
The room will be gradually warmed up
The room will be cooled to the temperature inside the refrigerator
The temperature of the air in room will remain unaffected

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