Answer:
1500 J
Step-by-step explanation:
We can solve the problem by using the first law of thermodynamics:

where
Uf is the final internal energy
Ui is the initial internal energy
Q is the heat absorbed by the system
W is the work done by the system
In this problem, we have:
Ui = 2000 J
Q = 1000 J
W = 500 J
Substituting into the equation above, we find:
