What would most likely happen if an engineer were able to reduce the amount of friction between the cars’ wheels and the track? A. The roller coaster would produce more heat.
B. The roller coaster would not produce any sound energy.
C. The roller coaster would go faster.
D. The roller coaster would go slower.

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