1. The problem statement, all variables and given/known data A system expands by 0.67 m^3 at a constant pressure of 105 kPa. Find the heat of the system if its internal energy decreases by 1710J. 2. Relevant equations Since P=constant: deltaU=Q-W W=PdeltaV 3. The attempt at a solution I tried plugging in the numbers to the equation for W and then plugging that value into the first equation to solve for U, but I didn't get the correct answer and I'm not sure where I went wrong.