While on Europa, you decide to test the depth of an ice cliff by dropping a rock and listening for when it hits the ground. If the gravitational acceleration on Europa is 1.315 m/s2, and it takes 15 s to hit the floor, how deep was the cliff? (Displacement should be negative)

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.