An object make a circular Shadow when held in one way and a rectangular Shadow when held in another way in the path of light the object may be a spare, disease, ring or cylinder​

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?

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

Which would increase mechanical advantage?