Which of these does NOT use the doppler effect? A; a weather center tracking a storm

B: elephants communicating over long distances

C: they all use the doppler effect

D: a police radar gun measuring speed

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!