7. (a) Describe a physical system and a social system that have had a positive effect on
your community or environment.
(b) Describe ways in which a physical system
and a social system have had a negative
effect on your local community or
environment. bu
a
ma
Solve a Problem!

10 points! will mark brainiest! in a heat engine if 1,000 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 initial energy was 2,000 j 1: write the equation2: 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 energy added you so much!