A planet has a period of revolution about the Sun equal to T and a mean distance from the Sun equal to R. T^2 varies directly as __________.

Question

A planet has a period of revolution about the Sun equal to T and a mean distance from the Sun equal to R. T^2 varies directly as __________.
R
R^2
R^3
R^4
R^5

bobpursley · Answer

. The Law of Periods: The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.