The electric potential difference between a charged sphere and Earth is 76.0 V when the sphere has been charged to 3.8×10−4 C. What is the capacitance of the sphere-Earth system? Help pls

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.