What is one limitation of using the jawbreaker as a model for earth's layers? a. the layers are all made out of the same material. b. the outside layer is the thinnest layer. c. the jawbreaker has four different layers. d. the jawbreaker can be split to show the inside.

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.