Agrindstone increases in angular speed from 4.00 rad/s to 12.00 rad/s in 4.00 s. through what angle does it turn during that time if the angular acceleration is constant?

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.