How much work do you do when you lift a child with 50N of force .5m?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

What are two different ways you could find the value of a? explain these methods.

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