Define an experimental error , and give two causes of systematic and random errors.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

If a star is moving toward earth, it is

Which wave is the result of amplification and produces a louder sound