After stating a hypothesis, what is the next step that a physicist is most likely to take in answering a question?
A. Planning and performing an experiment to answer the question
B. Reading journal articles to discover the best answer
C. Observing the conclusions drawn by other scientists with similar
questions
D. Identifying the theory that provides the best explanation of the
answer

current flows in a wire

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me