What keeps the electrons from leaving an atom in the rutherford model of the atom? a. strong electrostatic attraction to the nucleus b. strong attraction to other electrons c. the repulsive forces between electrons d. an outer coating on the atom e. the orbits of the electrons are circular?

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.