Represent the oxygen atom symbolically along with its two isotopes that have 9 and 10 neutrons.

Describe the path of the electric current through a circuit?

Positrons are spontaneously emitted from the nuclei of

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?