1. The problem statement, all variables and given/known data An astronaut weighs 672 N on the Earth. What is her weight on planet X, which has a radius Rx = Rearth / 2.00 and a mass Mx = Mearth/9.00? I know that the radius of Planet X is 3189.05 and that the mass of Planet X is 6.638x10^23 2. Relevant equations so i know that i need to find the gravity for planet X found with this equation gx = GM/R^2 and also that the eequation to find her mass is F=Mm/r^2 (at least that is what i think) 3. The attempt at a solution so i tried using that equation but it was wrong and then i figued out i prob needed the gravity but did not know exactly how to use it cause what do i use G for in the initial equation?