A system has 600 j of heat and does 300 j of work. What is the change in internal energy?

The final energy is 1,700 J

Explanation: According to first law of thermodynamics:

=Final energy-initial energy=Change in internal energy

q = heat absorbed or released

w = work done by or on the system

w = work done by the system = {Work done by the system is negative as the final volume is greater than initial volume}

q = + 500J {Heat absorbed by the system is positive}

w = work done by the system = - 300J