A cannon launches a 3.0\,\text {kg}3.0kg3, point, 0, start text, k, g, end text pumpkin with 110\,\text J110J110, start text, J, end text of kinetic energy. What is the pumpkin’s speed?

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

Matter that emits no light at any wavelength is called

How many astronauts have walked on the moon?