David tied a ball to the end of a long string. Holding the end of the string, he swung the ball in a circle around him to model how Earth orbits the sun. He knows that the orbit of Earth depends upon the gravitational pull. Which component of David’s model illustrates the effect of gravity?

A) The ball

B) The string

C) The distance from David

D) The speed the ball revolves

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

What is a view of science and psychology that says the value of knowledge depends on its usefulness? a. pragmatism b. psychotherapy c. physiology