Question

If an MP₃ player does 200 kJ of work and releases 100 kJ of heat, what is the change in internal energy for the MP₃ player? 

1. −300 kJ 

2. 300 kJ 

3. 100 kJ 

4. −100 kJ

Answer 1

Correct option 1. −300 kJ    

Explanation:

∆U = q + w

= −100 kJ + −200 kJ = −300 kJ