Gravity on Gliese 581 C.?

Quote from article : "And astronomers have identified the first Earth-like planet that could support liquid water and harbor life. The "super Earth," Gliese 581 C, weighs about five Earth masses and is either a rocky planet or one covered entirely by oceans, astronomers speculate. "





Reference : http://www.space.com/scienceastronomy/07...





Question : Would gravity on the surface be 5x greater than the gravity on earths surface? I think it might be, but maybe its not a linear thing like Im thinking.

Gravity on Gliese 581 C.?
It is also dependent upon Gliese 581 C's radius. Gravity varies across the Earth as the radius changes, for instance at San Fracisco it is 9.800 m/s² and at LA it is 9.796 m/s². The Law of Gravity of Isaac Newton is F = G M m/r² where F is the force of gravity between a mass M and another mass m which are each concentrated in a point. r is the distance between the two point masses, and G is the universal gravitational constant. The force of gravity acting on a person with mass m at sea level on Earth (with M = 5.976 × 1024 kg and r = 6,378,000 m) is roughly equal to F= 9.80 m/s².
Reply:Good Q


I think 5x
Reply:Not really. Sure, the mass has something to do with the gravity. But also the rotational period of a planet plays on gravity. We don't know the rotational period of that planet. The faster the rotation, the bigger the gravity, the slower the rotation, the less the gravity. So, the planetary mass and the rotation period plays a big part in this!

poppy