the mass of the moon is about 7.5*10^22 kg and its diameter is about 3.5*10^6 meters. calculate the weight of a 70 kg person on the moon. so we got F=G*m1*m2/d^2 G=6.67*10^-11N*m^2/kg^2 to find the mass we can use m1= F*d^2/m2*G (how did we manipulate the first formula to get this? no matter how i try to change the first formula it never ends up like this one) i have been trying to solve this for a week now. it`s not a homework. i am just trying to teach myself physics and this book i purchased is very superficial and leaves huge holes in explanations. please show me how to solve this. including the manipulations with scientific notation. thanks.