Ann is living in a dormitory room, and she has a small fan in the room.
On a summer day, she turns on her fan before leaving for classes, to
cool the room before she comes back in the evening. Does it work?
What is known:
- The size of the room is 4 m x 6 m x 6 m
- The power of the fan is 150 W
- She leaves at 8:00 am and comes back at 6:00 pm
- The room temperature is 15 oC when she leaves in the morning