1. A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction

Which device uses ac current to operate?

What are atoms of the same element with varying number of neutrons

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 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 energy added you so much!