Is the electric potential energy of a particle with charge q the same at all points on an equipotential surface?

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Positrons are spontaneously emitted from the nuclei of

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?