The moon is slowly moving away from the earth. what will eventually to the gravitational force between the earth and the moon? why?

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

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?

Aphase diagram assumes is kept constant.