Two balls at the ends of two strings are moving at the same speed in horizontal circular paths. One string is three times
as long as the other. Compare the magnitudes of the two
centripetal accelerations.

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.

The particles that are found in the nucleus of an atom are

Aparticle moves in a circle 1.50 m in radius . through what angle in radians does it rotate if it moves through an arc length of 2.50m? what is the angle in degrees?