Which statement about electric force is true? a) it is a purely attractive force. b) it is a purely repulsive force. c) it is both an attractive and a repulsive force. d) it is neither an attractive nor a repulsive force.

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false