In speed skating, the ice skates have toe picks at the end of each blade. This allows the athlete to push off from the ice with a high initial force when the race starts. These toe picks produce what type of force?

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.