of the following statements about the tides which are true?
-although we observe the tides coming in and going out, in reality earth is rotating into and out of various tidal bulges, which produces changing tides
-the tides are caused by and imbalance between the centripetal force and the gravitational force of the moon and the sun
-there are 2 tidal bulges on earth caused by the moon: one facing the moon, and the other facing away from the moon
-both earth and the moon orbit around their common center of mass, called the barycenter