How far must a 100 N/m spring stretch to hold up a 4 kg box?

Distinguish between a transverse wave and a longitudinal wave.

Which feature indicates that mars resides in the inner region of the solar system

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.