1) The center of mass of the Earth-Moon system is called the ________. 1) _____ A) perihelion B) barycenter C) perigee D) aphelion E) apogee 2) The barycenter follows ________. 2) _____ 3) The ________ force pulls an orbiting body toward the center of that orbit. 3) _____ 4) The difference between centripetal forces and gravitational forces is called the ________. 4) _____ 5) The tide-generating force varies ________. 5) _____ A) directly with the square of the distance between the objects B) inversely with the cube of the distance between the objects C) directly with the square of the distances of the objects divided by the product of the masses D) inversely with the square of the distance between the objects E) directly with the cube of the distance between the objects 6) If the resultant force has a significant horizontal component (tangential to Earth's surface), it produces tidal bulges on Earth, creating what are known as ________. 6) _____ 7) If the side of the Earth that faces the Moon experiences a high tide, then the side of the Earth that is opposite from the Moon will have a ________. 7) _____ 8) A full lunar tidal cycle is ________. 8) _____
9) Compared with a solar day, a lunar day is ________. 9) _____ A) twice the length of a solar day B) longer than a solar day C) shorter than a solar day D) equal to a solar day E) half the length of a solar day 10) The vertical difference between consecutive high and low tides is called the ________. 10) _____ 11) A spring tide ________. 11) _____ 12) Spring tide occurs about ________. 12) _____
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