PLEASE CAN SOMEONE ANSWER THIS? THE INSTRUCTIONS/PROBLEM IS IN THE PICTURE! I REALLY NEED THIS!

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this