Copernicus incorrectly assumed that the planets?

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

The necleus of an atom is made up of what subatomic particles?