Two ping-pong balls each have a mass of 2.7 g and carry a net charge of 0.470 μc . one ball is held fixed. part a part complete at what height should the second ball be placed directly above the fixed ball if it is to remain at rest there?

The graph represents the distance a car travels over time while on the highway. which statement about the car's trip is accurate? a) the car does not move over time. b) the car travels at a constant velocity. c) the car's velocity increases constantly over time. d) the car's velocity decreases constantly over time.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?