You may have noticed that when you compress the air in a bicycle pump, the body of the pump gets warmer.
(a) Assuming the pump and the air in it comprise the system, what is the sign of w when you compress the air?
(b) What is the sign of q for this process?
(c) Based on your answers to parts (a) and (b), can you determine the sign of ¢E for compressing the air in the pump? If not, what would you expect for the sign of ¢E? What is your reasoning?