A ball held in a person's hand does not move, even though gravity is acting on it because

When an object moves in uniform circular motion, the direction of its acceleration is a) in the same direction as its velocity vector. b) in the opposite direction of its velocity vector c) is directed toward the center of its circular path. d) is directed away from the center of its circular path. e) depends on the speed of the object.

Who was the first scientist to measure speed as distance over time?

Select the three ways that the parallel-plate capacitor differs from a car battery.