# A space expedition discovers a planetary system consisting of a massive star and several spherical planets. the planets all have the same uniform mass density. The orbit of each planet is circular. Question a scientific probe lands on several different planets, all of which have the same mass density but differ in radius . They measure the acceleration due to gravity on the surface of each planet. which of the followings shows a graph that can be used to determine an experimental value for the universal gravitational constant and an explanation of how to determine this value?

A space expedition discovers a planetary system consisting of a massive star and several spherical planets. The planets all have the same uniform mass density. The orbit of each planet is circular.

In the observed planetary system, Planet A orbits the central star at the distance of 2R and takes T hours to complete one revolution around the star.

Planet B orbits the central star at the distance of R. Which of the following expressions is correct for the number of hours it takes Planet B to complete one revolution around the star?

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1. The correct expression for the number of hours it takes Planet B to complete one revolution around the star is $\frac{1}{\sqrt{8}}.$
$\mathrm{The answer is option A.}$