Kristina demonstrates a toy for her younger brother. the steps to operate the toy are listed below. step 1. push the toy down. step 2. a spring compresses. step 3. release the toy. step 4. the toy jumps into the air. which best describes step 4?

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!