If two celestial bodies are brought 2x closer to each other, how does this affect the gravitational force between them?

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

What is a subatomic particle with a negative charge and very little mass?

It takes a lot of energy to get the temperature of water to increase and eventually boil because water has a high heat.