Heat Transfer Question
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A bulletin board with a number of papers pinned to it is positioned on the wall of the classroom just above a radiator. The papers lie still against the bulletin board when the radiator is not on, but in the winter when the radiator is turned on the papers on the bulletin board can be seen to move slightly. There is no breeze in the room and no one is touching the bulletin board. Use your knowledge of thermal energy transfer to explain why and how the papers begin to move after the radiators are turned on.