Physics please help!!

Assume a circular orbit. If a planet's distance from it star is multiplied by 25 times, then by how many times is its orbital period T multiplied ?

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asked by Jose
  1. Kepler’s Third Law. The square of the period is proportional to the cube of the distance from the star:
    T²∼R³
    If the distance is increased by 25,
    then T² is increased by 25³, which means T is increased by the sqrt(25³)=125.

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    posted by Elena

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