He mass of Mars is 6.42 * 1023 kg. Its moon Phobos is 9378 kilometers away from Mars and has a mass of 1.06 * 1016 kg. What is the gravitational force between Mars and Phobos? 5.16 * 1015 N 5.16 * 1021 N 4.84 * 1022 N 4.84 * 1025 N

The gravitational force between two objects is determined using the formula:

F = (GMm) / r^2, where F is the gravitational force between the two masses, G is the gravitational constant (6.67*10^-11), M and m are the masses of the two objects, and r is the distance between them. Substitute the given values and note that r = 9378 km must first be converted to meters to be consistent with the units. Thus, the gravitational force between Mars and Phobos is 5.16*10^15 N.