The Moon (7.3x 10 22 kg) located at a distance of 4 x10 m from the center of the Earth (6.0 x 10 24 kg ). The moon gets thrown out of earth's orbit. What is the acceleration of the moon when it is thrown out of earth's orbit ? (Hint: What is the Force of Gravitational Attraction between the planets? How is force and mass related to each other?)​

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?