What would be the value of g on the surface of the earth if its mass was twice and its radius half of what it is now ?

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

What would be the value of g on othe surface of the earth if tis mass was twice as large and its radius half of what it is now?

What would be the acceleration due to gravity on the surface of a planet if its radius is (1)/(4) the radius of the earth and its mass is (1)/(80) th the mass of the earth ?

What will be acceleration due to gravity on the surface of the moon if its radius were (1//4)^(th) the radius of earth and its mass (1//80)^(th) the mass of earth? What will be the escape velocity on the surface of moon if it is 11.2 km//s on the surface of the earth? (given that g=9.8 m//s^(2) )