Ahypothetical planet has a mass of 1.66 times that of earth, but the same radius. what is gravitiy near its surface?

Explanation:

The gravitational acceleration on the surface of the earth is

where G is the universal gravitational constant, is the mass of earth, and is the radius of earth,

in general for any object the gravitational acceleration or gravity on its surface is:

in this case we know that the mass is 1.66 times the mass of earth:

and the radius is the same as for earth:

so the gravity for this planet is

which can be written in the following form:

where we know that , so:

and the acceleration of gravity on earth is:

so the acceleration or gravity on the planet is:

3. dark matter

empty space could also be a simple vacuum