PLZ HELP DUE RIGHT NOW!! WILL MARK BRAINLEST IF CORRECT Which three workers use technologies that apply the Doppler effect?

A. An ultrasound technician

B. An insurance building inspector

C. A race-car mechanic

D. A pilot who needs to avoid bad weather

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!