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20-25% of Jupiter and Saturn is made up of this gas

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What do we mean by the orbital energy of an orbiting object (such as a planet, moon, or satellite)?A. Orbital energy is a measure of the object's speed as it moves through its orbit.B. Orbital energy is the amount of energy required for the object to leave orbit and escape into space.C. Orbital energy is the sum of the object's kinetic energy and its gravitational potential energy as it moves through its orbit.D. Orbital energy is the object's kinetic energy as it moves through its orbit.

Each choice below describes how a few astronomical phenomena are related to time periods. Which list is entirely correct? (Careful: some lists are partially correct.)A. Earth's rotation defines a day. The cycle of the Moon's phases takes about a week. Earth's orbit defines a year. Earth's cycle of axis precession defines a month.B. Earth's rotation defines a day. The Sun's rotation defines a week. The Moon's rotation defines a month. Earth's orbit defines a year.C. Earth's rotation defines a day. The cycle of the Moon's phases takes about a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years.D. Earth's rotation defines a day. The saros cycle of eclipses defines a month. Earth's orbit defines a year. Earth's cycle of axis precession takes 26,000 years.

Which of the following statements is not one of Newton's Laws of Motion?A. What goes up must come down.B. The rate of change of momentum of an object is equal to the net force applied to the object.C. In the absence of a net force acting upon it, an object moves with constant velocity.D. For any force, there always is an equal and opposite reaction force.

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