What are three chemical changes and what are three physical changes?

Select the word from the list that best fits the definition the nuclear family into which a person is born or adopted.

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .