answer is mars but all planets have a gravitation effect on the earth even gas planets
half of earths size
No. The gravity on Mercury is less than half that of Earth.
the sun
pokemon
g=Gx4(pi)/3xr3x(rho)/r2=Gx4x(pi)x(rho)xr/3Now if the radius is halved then acceleration will also halve.
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.
I'm not sure if it's half or not, probably less, but the only possibility would be Mercury. True. Mercury is the only one. Gravity on Mercury's surface is 37% of what it is on Earth. Except for Mars, where it's 38% of its value on Earth. Mercury and Mars are the only ones. Except for Pluto, where it's 4% of its value on Earth.
The force is inversely proportional to the square of the distance. So, half the distance means four times the force. So, the answer is: 4 million newtons. additional note: This is true only if the distance referred to is the distance to the center of the planet or if the distance to the planet is great enough to make the radius of the planet insignificant.
The force of gravity, pulled this molten material inwards towards the planet's center into the shape of a sphere. Later, when the planets cooled, they stayed spherical. Planets are not perfectly spherical because they also spin.
Mass remains the same; weight will be one half that of the same mass on earth.
Mercury and Mars both have surface gravity that's about 38 % of the Earth's. They are the nearest to being half.