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Suppose two asteroids are located at the same distance from the Sun. One  asteroid has twice the mass of the other. According to Newton's law of gravitation  (and ignoring all forces except that from the Sun), 1. the more massive asteroid feels half the force that the other does. 2. the more massive asteroid feels twice the force that the other does. 3. neither feels any force because they are weightless in space. 4. both asteroids feel the same force because gravity acts equally on all objects. The Copernican system for planetary motions is 1. Sun-centered, with the planets moving in elliptical orbits and the Sun at one  focus of the ellipse. 2. Earth-centered, with the planets moving in epicycles around the Earth. 3. Earth-centered, with the planets, the Sun, and the stars mounted on crystal  spheres, pivoted to allow the correct motions around the Earth. 4. Sun-centered, with the planets moving in perfect circles around the Sun.
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This note was uploaded on 09/03/2010 for the course ASTRO 101 taught by Professor R.moyer during the Fall '10 term at Miramar College.

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