A5m x 5 m × 4 m dormitory room is at 100 kpa and 20°c. a 150w fan is turned on for 4 hours inside the room. assuming all the doors and windows are tightly closed and disregarding any heat transfer through the walls and the windows. the gas constant of air is r 0.287 kj/kg-k, specific capacity c 0.718 kj/kg. k for air at room temperature. determine whether the room has been cooled down and calculate the final room temperature.