Two planets A and B are orbiting around their sun in circular orbits of radii r and 4r. In a quarter year of planet B, how many revolutions will the planet A make?

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TestHub · Accepted Answer

T A ​ = T B ​ ( 4 r r ​ ) 3/2 = 8 T B ​ ​ A quarter year of B is 4 T B ​ ​ = 2 T A ​ , so planet A makes 2 revolutions. Answer: 2

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