Astudent notices that the rocks along a shoreline are much smoother than they appear in pictures taken 100 years ago .which of the following best explains this observation

Which sound characteristic is not affected by the relative motion of an object

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

The electric field direction is defined by the direction of the force felt by (select one of the following answers): 1. a negative charge. 2. a positive charge. 3. both positive and negative charges.