A freshman chemical engineering student is walking across campus on a cold winter day. For each of the following scenarios, which forms of heat transfer (conduction, convection, and/or radiation) are operative, and which form do you think is dominant? In each case, explain your answer.
a. The student feels colder when a sudden gust of wind arises.
b. After sitting down on a concrete bench, the student feels even colder, especially in that part of the anatomy in contact with the bench.
c. Seeing some trash being burned in an incinerator, the student stands next to the fire and feels warmer.