A satellite orbits above the Earth. The satellite runs into another stationary satellite of equal mass and the two stick together. What is their resulting velocity?

An asteroid with a mass of approaches the Earth. If they are apart, what is the asteroid's resultant acceleration?

Which pulls harder gravitationally, the Earth on the Moon, or the Moon on the Earth? Which accelerates more?

Two satellites are a distance r from each other in space. If one of the satellites has a mass of m and the other has a mass of 2m, which one will have the smaller acceleration?

Two asteroids exert a gravitational force on one another. By what factor would this force change if one asteroid doubles in mass, the other asteroid triples in mass, and the distance between them is quadrupled?

An astronaut lands on a new planet. She knows her own mass, , and the radius of the planet, . What other value must she know in order to find the mass of the new planet?

An astronaut lands on a planet with the same mass as Earth, but twice the radius. What will be the acceleration due to gravity on this planet, in terms of the acceleration due to gravity on Earth?

In the International Space Station, which orbits the Earth, astronauts experience apparent weightlessness for what reason?

Two satellites in space, each with a mass of , are apart from each other. What is the force of gravity between them?