Friction always opposes the ​

What properties of a moving object are used in determining the object's energy of motion

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant

An element becomes a positively charged ion when itloses protons. loses electrons. gains electrons. gains neutrons.