Most of the energy we use on earth comes from the sun—how does that energy(light and thermal)end up? As energy in our food
As energy of wind or moving water
As energy that was our lights
As energy when we move around

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