A solid sphere of radius 40.0 cm has a total positive charge of 33.7 µC uniformly distributed throughout its volume. Calculate the magnitude of the electric field at the following distances.

(a) 0 cm from the center of the sphere
(b) 10.0 cm from the center of the sphere
(c) 40.0 cm from the center of the sphere
(d) 60.0 cm from the center of the sphere

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Relative to the ground below, how many joules of potential energy does a 1000-kg boulder have at the top of a 5-m ledge?