M(Earth) = 5.971024 kg (Mass of Earth)

M(Moon) = 7.351022 kg (mass of Moon)

R(EM) = 3.85108 m (average separation of Earth and Moon centers)

R(Earth) = 6.378106 m (radius of Earth)

R(Moon) = 1.738106 m (radius of Moon)

1a. At Earth's surface, what is its gravitational potential due to its mass only?

1b. At Moon's surface, what is its gravitational potential due to its mass only?

1c. At what point in space along a line between the two objects are the gravitational potentials from each of them equal?

1d. At that point, what is the total gravitational potential?