1) Assuming the pump and the air in it comprise the system, what is the sign of w when you compress the air?
Answer: a) w>0 b) w= 0 c) w<0
2) What is the sign of q for this process?
Answers: a) q>0 b) q= 0 c) q<0
3) Based on your answers to parts above, can you determine the sign of Delta E for compressing the air in the pump?
Answer: a) Sign of delta E is exactly negative b) cannot absolutely determine sign of delta E c) Sign of delta E is exactly positive