A system's thermal energy decreases by 21 J while the system performs 11 J of work. How much heat was added to the system?

Answer is in the photo. I can only upload it to a file hosting service. link below!

cutt.ly/nz6VGda

increasing transnational kinetic energy. because the transnational kinetic energy formula consists of only two variables, mass and velocity, increasing one of those properties is the only way to increase an object's transnational kinetic energy. increases to mass and velocity, however, do not have the same impact.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.