Gravity of the Earth if its mass were doubled

[Albert einstine]

What would be the value of gravity on the surface of the Earth if its mass was twice as large and its radius half of what it is now?

 

[berkeman]

What would be the value of gravity on the surface of the Earth if its mass was twice as large and its radius half of what it is now?

Welcome to the PF.

What have you found for the equation for gravitational force in your searching and reading so far? Also, is this a schoolwork question?

 

[mathman]

Your question leads to a density increase by a factor of 16, What would you use to make such a planet?