If I stare at a green square on a red background for a long time and then I stare at a white wall: do I see: 1.a red square on a green background.
2.a red square on a black background.
3.a green square on a white background.
4.a white background, as the figure and background cancel each other

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final