Lesson: Surface Gravity

The International Space Station orbits Earth at a distance of 409 km above the surface. Earth has a mass of kg and a radius of 6,370 km. What is the local acceleration due to gravity at the height at which the International Space Station orbits? Give your answer to 3 significant figures.

Mars has a mass of kg and a radius of 3,390 km. What is the surface gravity of Mars as a ratio of the surface gravity of Earth? Use a value of 9.81 m/s² for the surface gravity of Earth. Give your answer to 3 significant figures.

Ganymede is the largest moon in the solar system, with a mass of kg and a radius of 2,630 km. What is the surface gravity on Ganymede? Give your answer to 3 significant figures.