How can you tell if hair was forcibly removed?

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?