In an x-ray tube, electrons are accelerated through a large voltage and then slammed into a target. This causes the electrons to lose their energy very rapidly. The energy lost from the electron is converted into x-rays. What is the accelerating voltage of an x-ray tube that produces a spectrum of x-rays where the shortest wavelength is 0.039 nm

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

365.25 earth days are in the year of a light year

the awnser is d you right bro                      

the correct answer is "inertia"