You already stated in the question that it has 3.4 times the gravity of Earth.
Jupiter has approximately that surface gravity.
jupiter
Uranus.
No. The gravitational pull at the surface of a planet depends on that planet's mass and radius. Jupiter has the strongest gravity of any planet in the solar system: 2.53 times the surface gravity on Earth. Mercury has the weakest surface gravity at just 37% the gravity on Earth.
It is 3.055.<-not a decimal just a period
On Mars, there is low gravity, so there you could jump twice as high as you can on Earth. The acceleration due to gravity on mars is 3.71 m/s2, which is 0.379 times that of Earth. (The gravity on Earth is 2.64 times greater than the gravity on Mars.)
At the surface, it's about the same as the Earth's . You get a bit of variation in the value given, but, at the equator, it's about 1.065 times the Earth's. It is about 0.92 times the Earth's gravity, if you take into account the effect of the planet's rotation.
The force of gravity on Jupiter is 24.8 ms-2, a little over 2.5 times that on earth.
Despite the fact that Uranus has a mass 14.5 times Earth's mass, its surface gravity isless thanEarth's.Jupiter and Neptune both have more "surface gravity" than Earth.
If it is a rocky planet with a large iron core, Gliese 581c has a radius approximately 50% larger than that of Earth. Gravity on such a planet's surface would be approximately 2.24 times as strong as on Earth. If Gliese 581 c is an icy and/or watery planet, its radius would be less than 2 times that of Earth, even with a very large outer hydrosphere. Gravity on the surface of such an icy and/or watery planet would be at least 1.25 times as strong as on Earth.
No, the gravity of this planet will not be greater than that of earth. If the new planet has a mass equal to that of earth, its total gravity will be the same. There is a little ambiguity regarding 4 times earth density and half the earth's diameter if the idea is to keep the mass of this proposed planet the same as the earth. But setting that aside and assuming that the mass of the new planet is the same as earth's, the gravimetric field will be the same. Gravity is proportional to mass, and identical mass yields identical gravity. Now to the good part! The surface gravity of the new planet will be considerably higher than the surface gravity of earth. Both planets have the same mass and the same gravity, but a person standing on the surface of the new planet will be experiencing a whole lot more force pulling on him. All the mass of the new planet is beneath this person, but he's a lot closer to the center of gravityand will weigh a whole lot more.
The planet Venus. See more details here: http://www.answers.com/topic/Venus