Which must exist for electric charges to flow?

An object starts from rest at point f and speeds up continuously as it moves around an oval. a. choose a point about 1/8 th of the way around the oval from point f, and label it point g. draw a vector to represent the velocity of the object at point g. b. determine the change in velocity vector   between points f and g.

The plum pudding model of the atom states that ?

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