Does every solid have an odor?

What is the earliest point in the universe that we can observe? why can’t we see back further than this?

One form of energy can be another type of energy. a. created to form b. transformed into c. destroyed and then created to form

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?