What is the potential energy of a 2 kg book sitting on a shelf 2 meters above the ground

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

Aspectroscope breaks light up into its colors, allowing scientists to analyze light from the solar system and universe. by studying the spectral line patterns, widths, strengths and positions, scientists can determine the speed, position, and of celestial bodies. a) age b) origin c) rotation d) temperature

Which statement best explains why the overall charge on an atom is zero?