Physics

Problem

Moon P orbits planet A with a period of

20\,\text{h}

at a distance of

4.0\times10^{8}\,\text{m}

. Moon Q orbits planet B with the same period of

20\,\text{h}

but at a distance of

2.0\times10^{8}\,\text{m}

. Neglecting the moons’ masses, the ratio of the masses of the planets

M_{A}:M_{B}

is a)

1:8

2:1

8:1

4:1