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OpenStudy (maimi):
Imagine a planet with mass m1 that moves in a circular path with radius r1 (r1=a in Keplers 3rd law) around the planets and the suns shared center of mass. The suns mass is m2. Express the radius r1 in the planets circular path using the constants m1, m2 and R- which is the distance between the sun and the planet.
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OpenStudy (irishboy123):
your attempt?!?! this is simplified by the fact circular motion is assumed.
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