What is the force applied to a 300 kg block that has an acceleration of 6 meters per second squared? A) 30 N
B) 50 N
C) 60 N
D) 100 N

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.