When a certain horizontal spring is stretched a distance 10 cm, it exerts a restoring force of magnitude F = 20 N. The work done by a person in stretching this spring from x = 0 to x = 10 cm is

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

How would a small bar magnet be oriented when placed at position x?