Since an object weighs less on the surface of the Moon than on Earths surface, does it have less inertia on the Moon’s surface?

How long would a day be if the Earth were rotating so fast that objects at the equator were apparently weightless?

Two satellites are in orbit around the earth at the same altitude (distance from center of earth), and have the same orbital period. But one satellite is twice as massive as the other satellite.   Which statement below is true?   The satellites have the same centripetal acceleration, but the more massive satellite has a larger centripetal force.   Neither object has a force acting on it because they're in space.   The centripetal forces are the same because they are moving the same.   The more massive satellite has a larger acceleration, and therefore a larger centripetal force.

A new planet is discovered whose mass is the same as that of the Earth, although its radus is 2.4 times larger than Earth's radius. Find the acceleration of gravity on the surface of the new planet. Calculate answer to one decimal.