Which isotope is use to date ancient artifacts such as fossils?

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

Is the vertical component of velocity ever zero?