If a student runs one complete lap around the track a distance of 400 meters in 43 seconds what is the velocity at which the student traveled

In a laboratory, nakisha mixes sodium hydroxide solution with an indicator called phenolphthalein. when combined, they create a pink solution. nakisha wonders if mixing other solutions with phenolphthalein will also create this pink color. how could she use the scientific inquiry process to explore it further?

Why do electron microscopes have higher resolving power than light microscopes?

J. j. thomson’s experiment disproved the theory that an atom