What are the x and y components of a vector a in the xy plane if its direction is 50° counterclockwise from the positive direction of the x axis and its magnitude is 9 m?

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?

The mass of the sun is 1.99×1030kg and its distance to the earth is 1.50×1011m. what is the gravitational force of the sun on the earth?

Which describes increasing the efficiency of energy resource