HELP!! Does the normal force really exist? How do we know one way or the other?

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

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked

What are high points of a transverse wave