A Well-Sealed Room Contains 90 Kg of Air at 1

Multiple Choice

A well-sealed room contains 90 kg of air at 1 atm and 20°C. Now a 1-kW electric heater and a 200-W fan are turned on. If heat transfer through the walls is negligible, the air temperature in the room in 15 min will be

A) 36.7°C
B) 31.9°C
C) 33.9°C
D) 20.3°C
E) 49.5°C