MsR Mp Ms P R System A System B 4Mp AMS R System C Mp 6) Three different planet-star systems, which are far apart from one another, are shown above. The masses of the planets are much less than the masses of the stars. In System A, Planet A of mass Mp orbits Star A of mass M, in a circular orbit of radius R. In System B, Planet B of mass 4M, orbits Star B of mass M, in a circular orbit of radius R. In System C, Planet C of mass M, orbits Star C of mass 4M, in a circular orbit of radius R. (a) The gravitational force exerted on Planet A by Star A has a magnitude of Fo. In term of Fo, determine i) the magnitudes of the gravitational forces exerted on Planet B by Star B ii) magnitude of gravitational force exerted on Planet C by Star C b) Ranking the speed and the period of the planet. The speed: greatest smallest. Explain your ranking. The period: greatest smallest. Explain your ranking.