Two planets in circular orbits around a star have speeds of v and 7v. (a) What is the ratio of the orbital radii of the planets? rv r7v =  (b) What is the ratio of their periods? Tv T7v =

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Chapter39: Relativity
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Two planets in circular orbits around a star have speeds of v and 7v.
(a)
What is the ratio of the orbital radii of the planets?
rv
r7v
 = 
(b)
What is the ratio of their periods?
Tv
T7v
 = 
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